—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 toB．needn't have
C．didn't need toD．should have
B

試題分析：考查虛擬語(yǔ)氣。句意：—昨天晚上你沒(méi)有等斯密斯先生，是嗎？—不，我等他了。但是我們本沒(méi)有必要等他的。他根本沒(méi)有回來(lái)。Need not have done sth本不需要做某事，實(shí)際上卻做了。故B正確。
點(diǎn)評(píng)：注意在虛擬語(yǔ)氣中，but后面的句子使用陳述語(yǔ)序，要根據(jù)前面的虛擬語(yǔ)氣的形式來(lái)決定后面的時(shí)態(tài)。
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