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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单项选择题
It is requested that the engineer______ the design immediately.
A．worked out
B．worked out
C．to work out
D．work out
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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