[题目]He paid for a seat, when he have entered free.A．could B．wouldC．must D．need 题目和参考答案——青夏教育精英家教网—

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【题目】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“本来能够做某事”。他本来可以免费进入而事实是他没有这样做。

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