2. 外语
  3. After walking for half an hour, she realized that she______ in the wrong direction.

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

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问题 After walking for half an hour, she realized that she______ in the wrong direction.
选项 A、had been walking
B、has been walking
C、walked
D、would have walked
答案A
解析 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，她才意识到走错方向了。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。
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