单项选择题

Now it is important that our drinking water ______ purified.

A．should be
B．is
C．will be
D．was
<上一题 目录 下一题>
热门 试题

单项选择题
The two sisters look very much ______.
A．alike
B．like
C．likely
D．likewise
单项选择题
The washing-machine we bought four years ago needs ______.
A．repaired
B．repairing
C．being repaired
D．to repair
相关试题