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
The twins ______ American girls. They are in ______ class.
A． are, the same
B． is, the same
C． is, same
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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