单项选择题

He was playing softly ______ disturb anyone.

A. so as not to
B. so as to not
C. so not as to
D. not so as to
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Owing to the bad weather, the match has been ______.
A. put out
B. put over
C. put off
D. put through
单项选择题
There was nothing ______ we could do to prevent the accident.
A. which
B. what
C. that
D. as
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