单项选择题

Such birds have never been heard ______ at night.

A．to be sung
B．are singing
C．to sing
D．sing
<上一题 目录 下一题>
热门 试题

单项选择题
This test is rather difficult, ______ it is not beyond the reach of the students.
A．×
B．so
C．for
D．but
单项选择题
—Is it a recorded football match —No, it is ______ football match.
A．a lively
B．a living
C．an alive
D．a live
相关试题