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
______ he is still working on the project, I don't mind when he will finish it.
A．In case
B．As long as
C．Even if
D．As far as
单项选择题
The hotel ______ during the vacation was rather poorly managed.
A．as I stayed
B．where I stayed
C．which I stayed
D．what I stayed
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