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
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单项选择题
The actor, ______name I forget, has played in several successful films．
A．whom
B．whose
C．who
D．which
单项选择题
The old man couldn't help______of what his wife said once again．
A．to think
B．thought
C．thinking
D．have thought
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