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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单项选择题
My little sister is only five, ______ she can swim well.
A． but
B． so
C． because
单项选择题
My mother ______ off the bike and broke her leg on the ground.
A． falls
B． was falling
C． fell
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