Question

【题目】"He ________ lived well on his good looks, but instead he chose to thrive(成功) on his talent." People praised Ning Zetao like this.

A. should haveB. must haveC. might haveD. could have

Answer 1

【答案】D

【解析】

试题分析：考查情态动词。句意：以他的外表他本来能生活的更好，但是相反，他选择依靠他的才华成功。could have done本来能做而没有做。故选D。

【知识归纳】

情态动词have done的用法讲解

1、can have done的用法 can have done用于对过去动作的推测，表示“可能”，常用于否定句和疑问句。She can't have gone to work. It's Sunday.她不可能去上班，今天是星期日。

2、must have done的用法 must have done用于对过去动作的推测，表示"可能一定……"，用于肯定的陈述句中。I have not seen him for quite a long time. He must have been very busy.我很久没见他了，他一定很忙。

3、may have done的用法 may have done用于对过去动作的推测，表示 "或许;可能"，多用于肯定句和否定句。She is late. She may have missed the bus.她迟到了，她可能没赶上车。

4、ought to/should have done的用法 ought to/should have done的肯定形式表示"过去应该做的事而没有做"，其否定形式表示 "过去不该做的事却做了"，含有批评的意思。Jenny should have kept her word. I wonder why she changed her mind. 詹妮应该信守诺言。我不知道她为什么改变了主意。

5、need have done的用法 need have done一般多用于否定句或疑问句中，表示 “本来不必做的事却做了”。You needn't have told that to him.你本来没有必要把那事告诉他。(实际却告诉了)

You needn’t have hurried.你本来不必这么匆忙。(却忙了一阵子)

There was plenty of time. She needn’t have hurried. 还有时间，她没必要如此匆忙。

6、could have done的用法 could have done表示对过去动作的推测，作用和can have done相同，但表达的可能性较小或说话人更加不肯定。John could have overslept again.约翰可能又睡过头了。

7、might have done的用法 might have done表示程度上比may更小的可能性。He might have arrived home by now. Let's ring him up again.现在他可能已经到家了，我们再给他打一次电话吧。

巧记表“推测”的情态动词用法

表“推测”时，情态动词可用can,could,may,might,must。must表“一定”，只用于肯定句，其否定形式要用can’t;may(might)表“或许”，可能性较小，不用于疑问句;can表“可能”，不用于肯定句。

为方便记忆，可用一句话来记忆，即：肯(can)不肯?妹(may)不问，妈妈(must)肯定不否问。“肯(can)不肯”即can不用于肯定句;“妹(may)不问” 即may不用于疑问句;“妈妈(must)肯定不否问” 即must只用于肯定句,而不用于否定句和疑问句中。