单项选择题

The new staff didn't know how to use the system ________I explained it to him yesterday.

A．until
B．because
C．if
D．since
<上一题 目录 下一题>
热门 试题

单项选择题
________by the failure of the project, the manager could hardly say a word.
A．To be shocked
B．Shocked
C．Be shocked
D．Shocking
单项选择题
________is reported in the newspapers that the talks between the two companies have not made any progress.
A．That
B．What
C．It
D．As
相关试题