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20. ―You didn't wait for Mr Smith last night, did you?

―Yes, but we    . He didn't return home at all.

A. don't have to      B.  needn't have

C. don't need to     D. should have

20.   B考査情态动词。句意:"你们昨晚没有等史密斯先生,是吗?""不,我们等了,但实际上没有必要,因为他(昨晚)根本就没回家。"本句中yes表示昨晚,了史密斯先生。但从下文中看出,他根本就!回家。所以可知"本没有必要等"。need not have done表示的意思是"本不需要做"。本题have 后省略了 waited,其他选项不符合句意。

题目来源:2015全品语法快练高中英语新课标 > 训练30动词变化类综合训练

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