单项选择题

I ______ a letter to my brother this time yesterday.

A．wrote
B．had written
C．was writing
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单项选择题
He ______ fifty dollars for the shirt.
A．spent
B．cost
C．paid
单项选择题
______ is true to say that a dog is man's best friend.
A．That
B．What .
C．It
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