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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单项选择题
My litter sister is only five,__________ she can swim well.
A．but
B．so
C．because
单项选择题
Many people want to __________ friends with him because he is very kind
A．do
B．make
C．keep
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