单项选择题

Tom kept quiet about the accident () lose his job.

A. so not as to
B. so as not to
C. so as to not
D. not so as to

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单项选择题
He suggested that they () use a trick instead of fighting.

A. should
B. would
C. do
D. had
单项选择题
All the preparations for the task()，and we’re ready to start．

A．completed
B．complete
C．had been completed
D．have been completed
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