单项选择题

That is the key______solving the problem.

A．at
B．to
C．for
D．in
<上一题 目录 下一题>
热门 试题

单项选择题
Over sixty percent of the church______destroyed during a bomb (炸弹) attack in the second World War.
A．have been
B．has been
C．was
D．were
单项选择题
He was only an office boy before______the position.
A．being appointed
B．appointed
C．appointing
D．having appointed
相关试题