请教一道英语语法题,为什么The parents watched the children _________ their invention.A.demonstrating B.demonstrate C.to demonstrate D.demonstrated

请教一道英语语法题,为什么The parents watched the children _________ their invention.A.demonstrating B.demonstrate C.to demonstrate D.demonstrated 请教高中英语语法题一道I can hardly imagine Peter____ across the Atlantic Ocean in five days.A.sailB.to sailC.sailingD.to have sailed请问为什么?D错在何处? 请教英语语法题一道!词典写道：Notice sb. doing.为何这道题答案是nobody notice the thief glide into the house?而不是popping into类? first par 请教英语大师 请教英语语法 have and takeCan I have the key?可以用take吗?为什么? 解释一道英语语法题The picture (hanging) on the wallis painted by him.(hanging)为什么不用被动 一道英语语法题,为什么选A?详细说明下, 请教一道英语语法题请教一题英语语法题,Walter offered us a lift when he was leaving the office,but our work_______,we declined the offer.选项:A.not being finished B.not having finished.C.had not been finished D was not finished 每 一道英语语法题目如题：Mother asked the youngest girl _______ with her toy car.a. what the matter was b. what was the matter 选哪个,为什么 请教英语语法 remain and keep这两个有啥区别.you must keep the rom warm.为什么不用remain 请教一道英语语法题last year,he became _____teacher and his friend turned ___doctor.第一个空肯定是a 了,但是为什么第二个正确答案什么都不填呢?职业前不是要有冠词么? 英语语法： 为什么要加the英语语法：为什么要加the 请教一道几何题 请教一道线性代数题 par. 请教一道数学建模的题,详情如下为什么呢? 一道高中英语语法填空题 There will be a meeting,________(start) later this year to review the film.starting为什么不能填started? 问一道英语语法题!I will give you____to finish the work.A.two weeks' time B.two-week time但B为什么不能选呢