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
—Did you telephone the manager's office—Yes, he______ back before tomorrow noon
A．express
B．is expected
C．expected
D．is to be expected
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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