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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单项选择题
Mary ______ that piece of cake for twenty yuan.
A． spent
B． cost
C． bought
单项选择题
Hurry up. Don't keep Xiao Wang ______.
A． wait
B． waited
C． waiting
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