单项选择题

Knock______the door before you enter the room.

A. on
B. for
C. at
D. in
<上一题 目录 下一题>
热门 试题

单项选择题
I wanted to thank them for all their ______.
A. kind
B. kindly
C. kindness
D. kindnesses
单项选择题
It suddenly ______ to me that somebody might be able to lend us the money.
A. came
B. turned
C. referred
D. occurred
相关试题