单项选择题

______today, he would arrive in Washington by next Wednesday．

A．If he leaves
B．Were he to leave
C．Would he leave
D．Was he leaving
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单项选择题
It is______a difficult problem______nobodY can solve it．
A．such, that
B．so, that
C．so, as
D．such, as
单项选择题
The actor, ______name I forget, has played in several successful films．
A．whom
B．whose
C．who
D．which
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