单项选择题

I stayed up all night ______ to find a new solution to the problem.

A．trying
B．have tried
C．try
D．tried
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单项选择题
I expressed hope ______ they would come to visit China again.
A．that
B．as
C．although
D．whether
单项选择题
They came to inspect the house ______ buying it.
A．in the event of
B．with a view of
C．with reference to
D．on account of
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