Someone at the door. Can you open it? A. knocks B. knocked C. is knocking D. was knocking 题目和参考答案——青夏教育精英家教网—

题目内容

12. Someone at the door. Can you open it?

A. knocks B. knocked

C. is knocking D. was knocking

12. C

句意:有人正在敲门。你可以把门打开吗？由句意可知此处应用现在进行时，故选C。

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