2. 外语
  3. After (driving) twenty miles, he suddenly (realized) that he (has been) (driving) in a wrong direction.

After (driving) twenty miles, he suddenly (realized) that he (has been) (driving) in a wrong direction.

admin2008-10-10  49
问题 After (driving) twenty miles, he suddenly (realized) that he (has been) (driving) in a wrong direction.
选项 A、driving
B、realized
C、has been
D、driving
答案C
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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成人本科学位英语

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