After walking for half an hour, she realized that she__________ in the wrong direction.

A．had been walking

B．has been walking

C．walked

D．would have walked

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答案解析

【译文】在走了半个小时后，她意识到她一直走错了方向。
【解析】本题考查时态。过去完成进行时表示某个过去正在进行的动作或状态，持续到过去某个时刻还未完成，一直持续到当前才结束。结合此题，在半个小时之前就开始走，持续到半个小时之后，她才意识到走错了方向。所以用过去完成进行时。B项是现在完成进行时，C项是一般过去时，D项是过去将来完成时。故选A。

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