单项选择题

It is essential that we ______ measures to protect the ozone layer.

A．will take
B．should take
C．would take
D．took
<上一题 目录 下一题>
热门 试题

单项选择题
We must study English well, no matter ______ difficult it is.
A．what
B．however
C．how
D．that
单项选择题
I expressed hope ______ they would come to visit China again.
A．that
B．as
C．although
D．whether
相关试题