单项选择题

He has solved the problem ______ the tractor was out of order.

A．why
B．for which
C．which
D．that
<上一题 目录 下一题>
热门 试题

单项选择题
-- Let's go dancing, ______. -- Yes.
A．shall we
B．will we
C．don't we
D．do we
相关试题