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  32
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://kaotiyun.com/show/uk3O777K
0

成人本科学位英语

相关试题推荐
随机试题
最新回复(0)