单项选择题

______ is your father, an engineer or a professor

A． Who
B． What
C． Which
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单项选择题
______ is true to say that a dog is man's best friend.
A． That
B． What .
C． It
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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