△In1850,about a third of U.S.A.( )covered by forests.A.were B.has been C./ D.was △Half of the△In1850,about a third of U.S.A.( )covered by forests.A.were B.has been C./ D.was△Half of the class haven't done all of the homework because some ( )r

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△In1850,about a third of U.S.A.( )covered by forests.A.were B.has been C./ D.was △Half of the△In1850,about a third of U.S.A.( )covered by forests.A.were B.has been C./ D.was△Half of the class haven't done all of the homework because some ( )r

△In1850,about a third of U.S.A.( )covered by forests.A.were B.has been C./ D.was △Half of the△In1850,about a third of U.S.A.( )covered by forests.A.were B.has been C./ D.was△Half of the class haven't done all of the homework because some ( )r
△In1850,about a third of U.S.A.( )covered by forests.A.were B.has been C./ D.was △Half of the
△In1850,about a third of U.S.A.( )covered by forests.
A.were B.has been C./ D.was
△Half of the class haven't done all of the homework because some ( )really difficult.
A is B are
请各位亲回答时,说出理由.
为什么third of U.S.A.看作整体,翻译成什么?

△In1850,about a third of U.S.A.( )covered by forests.A.were B.has been C./ D.was △Half of the△In1850,about a third of U.S.A.( )covered by forests.A.were B.has been C./ D.was△Half of the class haven't done all of the homework because some ( )r
△在1850年,美国有1/3的土地被森林覆盖.选B
△班里一半的学生没完成家庭作业,是因为有些题实在太难了.选A

△In1850,about a third of U.S.A.( )covered by forests.A.were B.has been C./ D.was △Half of the△In1850,about a third of U.S.A.( )covered by forests.A.were B.has been C./ D.was△Half of the class haven't done all of the homework because some ( )r 【英语】关于主谓一致△In1850，about a third of U.S.A.( )covered by forests.A.were B.has been C./ D.was△Half of the class haven't done all of the homework because some ( )really difficult.A is B are为什么third of U.S.A.看作整体， They have a big TV in thir house变否定句 The basketball fan has _ of basketball collections.A.hundred B.hundreds C.a hundred D.a hundreds-What do you think about the movie?-I like it very much,I have seen it for _ times,and I want to see it for a _ time.A.two,three B.second,third C.two thir two weeks ----enough for us to finish the work,and we need -----week A isn't a third B aren,t thir为什么选A 说理由A isn't.a third B aren,t .third 是 两空呀 about a for a moment和for the moment分别是什么意思?有什么区别吗?那这句话They have thir reasons for keeping their marriage a secret for _________ moment.意思不就解释不通了么？ 一个英文短文 Tom ,Sam ,Jim and Jack live in a building with four floors.they live on different floors .they have different jobs.an engineer ,a worker,a teacher and a doctorthe engineer lives on the ground floor（底楼) .Jack lives on the thir lets talk about a what about a cake? les' talk about a what about ( )a walk what about a break a book about animals a book about animals a exam for/about what about a watch? a programme about