单项选择题

I always keep fruit in the fridge ______ insects off it.

A．so as to keeping
B．so as keep
C．so as to be kept
D．so as to keep
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单项选择题
If I can help ______, I don't like working late into the night.
A．so
B．that
C．it
D．them
单项选择题
______ he has limited technical knowledge, the old worker has a lot of experience.
A．Since
B．Unless
C．As
D．Although
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