题目内容
He paid for a seat, when he _____ have entered free.
| A.could | B.would | C.must | D.need |
A。
could have done的意思是“本来可以做某事”。句子语境为“虽然他本来能够免费入场,但他买了票”。
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题目内容
| A.could | B.would | C.must | D.need |