如:one grade in the 30s上下文:which indicates that there were no grades below 30,one grade in the 30s,one in the 40s,none in the 50s,two in the 60s,three in the 70s,two in the 80s,four in the 90s,and one grade of 100.

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如:one grade in the 30s上下文:which indicates that there were no grades below 30,one grade in the 30s,one in the 40s,none in the 50s,two in the 60s,three in the 70s,two in the 80s,four in the 90s,and one grade of 100.

如:one grade in the 30s上下文:which indicates that there were no grades below 30,one grade in the 30s,one in the 40s,none in the 50s,two in the 60s,three in the 70s,two in the 80s,four in the 90s,and one grade of 100.
如:one grade in the 30s
上下文:
which indicates that there were no grades below 30,one grade in the 30s,one in the 40s,none in the 50s,two in the 60s,three in the 70s,two in the 80s,four in the 90s,and one grade of 100.

如:one grade in the 30s上下文:which indicates that there were no grades below 30,one grade in the 30s,one in the 40s,none in the 50s,two in the 60s,three in the 70s,two in the 80s,four in the 90s,and one grade of 100.
没见过这样的句式.30s一般是年代或者岁,这里应该是年代,上世纪30年代

30秒吗？？
你至少把上下文贴出来啊

年代--30年代

如:one grade in the 30s上下文:which indicates that there were no grades below 30,one grade in the 30s,one in the 40s,none in the 50s,two in the 60s,three in the 70s,two in the 80s,four in the 90s,and one grade of 100. Are you in _____?A.grade one.B.Grade-One.C.Grade One.D.grade-One we are in the grade one哪错了 we are in Grade One.(就in Grade One提问) Is she in Grade One grade one in high scholl They are in Grade One.对Grade One划线提问 student in grade one 还是student of grade one He is in Grade one.对Grade one提问 The numbet of the students in grade one ( ) 40 AThe numbet of the students in grade one ( ) 40 Ais Bare Cbe Dhas in,Tony,is grade,class,one,two Is Kim in Class One,Grade he is in grade one提问 He is in (Grade one).括号提问 in Grade 3中文 He is in Class Ten,Grade One at the No .1 Middle School.改为同义句 in the eigth grade 还是in eigth grade There are more students in Grade Two than _____A Grade One B other Grade C in Grade One D any Grade