单项选择题

It was（）that he couldn't finish it alone.

A．a so difficult job
B．so a difficult job
C．such a difficult job
D．such difficult a job

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单项选择题
The laboratory technician often warns the trainees that they can't be（）careful in doing the experiment.

A．much
B．so
C．most
D．too
单项选择题
The chairman（）a question for discussion.

A．aroused
B．raised
C．arose
D．rose
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