【題目】He paid for a seat, when he________have entered free.

A．could

B．would

C．must

D．need

【答案】A

【解析】could have done表示“本來(lái)能夠做某事”。他本來(lái)可以免費(fèi)進(jìn)入而事實(shí)是他沒(méi)有這樣做。

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