单项选择题

They thought it（）question to answer.

A．too difficult
B．too difficult a
C．a too difficult
D．too a difficult

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单项选择题

There is no knowing（）may happen in that case.

A．which
B．that
C．who
D．what

单项选择题

（）misunderstanding can prevent you from helping each other more.

A．Nothing but
B．Anything but
C．But for
D．Rather than

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