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

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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
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
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