2. 外语
  3. I( )on the door for ten minutes now without an answer.

I( )on the door for ten minutes now without an answer.

admin2019-02-22  27
问题 I( )on the door for ten minutes now without an answer.
选项 A、was knocking
B、am knocking
C、knocking
D、have been knocking
答案D
解析 本题考查动词时态的用法。for ten minutes now作时间状语，动词应用完成时态。
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