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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

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热门试题

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