题目内容
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。
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