-Did you clean the lab after the experiment?-No.I .but I forgot．( )A．shouldB．should haveC．ought toD．must have 题目和参考答案——青夏教育精英家教网—

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7．-Did you clean the lab after the experiment？
-No，I _____，but I forgot．（　　）

A．

should

B．

should have

C．

ought to

D．

must have

分析句意为：--做过实验后你打扫实验室了吗？--没有，我本应该打扫的，但是我忘了．

解答答案：B 根据上半句可知，他们说的是过去的事情，表示过去本应该做某事而没有做，一般用should have done，must have done表示对过去肯定的推测．所以本题选择B．

点评考查虚拟语气要注意分析各个情态动词在虚拟语气中的正确使用．should have done表示过去本应该做某事而没有做；must have done表示对过去肯定的推测．

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