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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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

（）made her disappointed was her son's failure in the exam.

A．How
B．What
C．That
D．Why

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