单项选择题

Suddenly he heard someone ______ gently on the window.

A．knock
B．knocking
C．knocked
D．to knock
<上一题 目录 下一题>
热门 试题

单项选择题
______ his great delight, his painting was accepted for publication.
A．For
B．With
C．In
D．To
单项选择题
At no time ______ what was happening.
A．the President was aware of
B．the President was aware about
C．was the President aware of
D．was the President aware on
相关试题