单项选择题

If only we ______ then, the disease was curable.

A．knew
B．could know
C．had known
D．would have known
<上一题 目录 下一题>
热门 试题

单项选择题
He wishes he to the theater last night.
A．has gone
B．went
C．had gone
D．would
单项选择题
______ from the sun ______ we get light and heat.
A．It was ... that
B．It is ... that
C．It was ... which
D．It is ... which
相关试题