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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单项选择题
There was nothing ______ we could do to prevent the accident.
A．which
B．what
C．that
D．as
单项选择题
Paul is a very ______ character; he is never relaxed with strangers.
A．self- conscious
B．self- confident
C．self- serving
D．self- satisfied
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