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I( )on the door for ten minutes now without an answer.A、was knockingB、am knocki
I( )on the door for ten minutes now without an answer.A、was knockingB、am knocki
游客
2025-03-06
43
管理
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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