-Is this computer working well now?-Yes．My mother it repaired．( )A．need have hadB．can have hadC．must have hadD．should have had 题目和参考答案——青夏教育精英家教网—

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18．-Is this computer working well now？
-Yes．My mother _______ it repaired．（　　）

A．

need have had

B．

can have had

C．

must have had

D．

should have had

分析 -这台电脑现在运转正常吗？
-是的．我妈妈肯定已经把它修好了．

解答答案：C．根据Yes可知电脑现在运转正常，所以电脑肯定已经被修理了，因此用must have done 表示"肯定做过某事"，所以答案是C．其他选项的含义分别是A项一般不用，need一般用否定，needn't have done 表示"本不必做"；B表示"可能做过某事"；D表示"本应该做而没有做"．

点评考查情态动词．情态动词的完成式．
1．must+have done：用于肯定句，表示推测，意为"一定（已经）…"．
2．can+have done：用于否定句或疑问句，表示推测，意为"可能（已经）…"．
3．could+have done：可用于肯定句、否定句或疑问句，表示推测、责备或遗憾等，意为"可能…"、"本来可以…"、"本来应该…"等．
4．should[ought to]+have done：可用于肯定句、否定句或疑问句，表示责备或遗憾等，意为"本来应该…"．
5．need+have done：用于否定句或疑问句，用于否定时意为"本来不必"，用于疑问句时意为"有必要…吗"．
6．may+have done：用于肯定句或否定句，表示推测，意为"可能（已经）…"．
7．might+have done：用于肯定句或否定句，表示推测，意为"可能（已经）…（此时 might 可换为 may）；另外还可以表示过来可能发生的事结果未发生，意为"本来会…"（此时 might 不能换为 may）．

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