单项选择题

Hurry up. Don't keep Xiao Wang ______.

A． wait
B． waited
C． waiting
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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． tell
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