I( )on the door for ten minutes now without an answer.A、was knockingB、am knocki

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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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Forthispart,youareallowed30minutestowriteacompositiononthetopicA