单项选择题

My little sister is only five, ________ she can swim well.

A．but
B．so
C．because
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单项选择题
Many people want to ________ friends with him because he is very kind.
A．do
B．make
C．keep
单项选择题
--Must I turn off the light when I leave--NO,________
A．you mustn’t
B．you can’t
C．you needn’t
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