He paid for a seat, when he ________have entered free.A、couldB、wouldC、mustD、n

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问题 He paid for a seat, when he ________have entered free.

选项 A、could
B、would
C、must
D、need

答案 A

解析 could have done的意思是“本来可以做某事”，符合语境。句意:虽然他本来能够免费入场,但他买了票,故选A。

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