题目内容
18.Many questions have been answered by John.He must have previewed the lessons last night,____ he?( )A. | needn't | B. | hasn't | C. | didn't | D. | mustn't |
分析 许多问题已经被John回答了,他昨晚一定预习功课了,是吗?
解答 答案:C
此题中含有情态动词must表推测用法,对过去动作的推测,此时must的表现形式为must have done,单纯表示对过去的推测(一般句中有明确的过去时间状语),与现在无关,反意疑问句附加部分"didn't--?".本句中动作在昨天晚上,所以用didn't反问,故选C.
点评 考生要掌握must表示推测用法的反义疑问句的用法. 反义疑问句中,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"
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