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单选题
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
参考答案
参考解析
解析：
句意：在步行半个小时后，她意识到她在此之前走错方向了。这里主要考查动词的时态。根据realized可知她走错是在realized之前，因此是过去的过去，要用过去完成时，又因直到她realized的时候她仍然在继续向前走，因此要用过去完成进行时态。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。
句意：在步行半个小时后，她意识到她在此之前走错方向了。这里主要考查动词的时态。根据realized可知她走错是在realized之前，因此是过去的过去，要用过去完成时，又因直到她realized的时候她仍然在继续向前走，因此要用过去完成进行时态。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。
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