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

游客2024-01-17 83

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。

转载请注明原文地址:https://tihaiku.com/zcyy/3371306.html

相关试题推荐

随机试题

最新回复(0)

Forthispart,youareallowed30minutestowriteacompositiononthetopicA