问题: 7 By the time he realizes he ——————
7 By the time he realizes he ——————on it for more than an hour。A walks B walked C has walked d had wolked
解答:
C
从for more than an hour看出指的是一个时间段里面的动作
he realizes用的是一般时，前后时态统一，应该用现在完成时has walked
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