单项选择题

Mary ______ that piece of cake for twenty yuan.

A． spent
B． cost
C． bought
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单项选择题
Hurry up. Don't keep Xiao Wang ______.
A． wait
B． waited
C． waiting
单项选择题
English ______ in many schools in our country.
A． is taught
B． taught
C． has taught
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