题目内容
1.Your room must have been cleaned yesterday, ?( )| A. | wasn't it | B. | haven't it | C. | hasn't it | D. | mustn't it |
分析 你的房间昨天肯定被打扫过,是吗?
解答 答案A.反意疑问句,注意前否定,后肯定;前肯定后否定,it替代your room,结合yesterday,当must+have done表示对过去的情况进行推测,问句要根据陈述部分谓语的情况用"didn't+主语"或"wasn't/weren't+主语";这里主语your room,是动词clean的承受者,结合yesterday故用过去时被动语态was+cleaned,故答案是A.
点评 当must+have done表示对过去的情况进行推测(一般句中有明确的过去时间状语),问句要根据陈述部分谓语的情况用"didn't+主语"或"wasn't/weren't+主语";如果强调动作的完成(一般没有明确的过去时间状语),问句要用"haven't/hasn't+主语".She must have read the novel last week,didn't she?她上星期一定读了这本小说,是吗?You must have told her about it,haven't you?你一定把这事告诉她了,是吗?
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