单选题
After (driving) twenty miles, he suddenly (realized) that he (has been) (driving) in a wrong direction.
A、
driving
B、
realized
C、
has been
D、
driving
【正确答案】
C
【答案解析】
应改为had been。表示已经开了那么久，前面用了过去时realized，后面用过去完成时。
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