I ______on the door for ten minutes now without an answer.A、was knockingB、am kn

游客2025-03-17 23

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

解析本题测试时态。本句的意思是： “我直到现在敲了 10分钟门也没人回答。”“have been doing”是现在完成进行时，表示从过去某一时间开始持续到现在的动作。例如：He has been waiting for you for the whole morning，(他等了你整整一个上午了。)

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