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
My mother ______ off the bike and broke her leg on the ground.
A． falls
B． was falling
C． tell
单项选择题
I ______ go there this morning, so I stayed home.
A． didn't need to
B． didn't need
C． needn't to
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