Professor Pile ______ to Hangzhou before, so I went to meet him at the airport.A

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问题 Professor Pile ______ to Hangzhou before, so I went to meet him at the airport.

选项 A、didn’t go
B、hasn’t been
C、wouldn’t go
D、hadn’t been

答案 D

解析该题考查考生对时态的掌握。我去机场接Pile教授的行为发生在过去，那么教授从未到过杭州的事实应该在此行为之前，所以要用过去完成时。

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