单项选择题

Don't let the child play with knives ______ he cuts himself.

A．so that
B．now that
C．only if
D．in case
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单项选择题
When and where the meeting will be held ______ a mystery.
A．to remain
B．remain
C．remains
D．is remaining
单项选择题
Between 1974 and 1997, the number of overseas visitors expanded ______ 27%.
A．by
B．for
C．to
D．in
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