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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单项选择题
I ______ a letter to my brother this time yesterday.
A． wrote
B． had written
C． was writing
单项选择题
______ we can find something about him on the Internet.
A． Maybe
B． May
C． Must
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