单项选择题

My litter sister is only five,__________ she can swim well.

A． but
B． so
C． because
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单项选择题
Three of them have gone to the library. What about __________
A． the other
B． the others
C． others
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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