单项选择题

The teacher often warns the students that they can't be（）careful in answering an English paper.

A．much
B．so
C．most
D．too

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单项选择题

However（）I couldn't find the solution to the problem.

A．hard did I try
B．hard I tried
C．I tried hard
D．I did try

单项选择题

Because of the terrible weather, the mountain climbers decided to put off the plan（） the next weekend.

A．at
B．in
C．on
D．until

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