单项选择题

It was not until 1920 ______ regular radio broadcasts began.

A．when
B．which
C．that
D．since
<上一题 目录 下一题>
热门 试题

单项选择题
-- Hi, be careful.-- Sorry, ______.
A．I don' t notice
B．I' m not noticing
C．I wasn' t noticing
D．I didn' t notice
单项选择题
He said that he would drop ______ at the Union Club on his way home.
A．on
B．to
C．in
D．of
相关试题