单项选择题

The first thing ______ we should do is to work out a plan.

A．which
B．that
C．where
D．what
<上一题 目录 下一题>
热门 试题

单项选择题
I ______ two hours on this math problem.
A．spent
B．paid
C．cost
D．taken
单项选择题
Not until the early years of the 19th century ______ know what heat is.
A．did man
B．man did
C．have man
D．man have
相关试题