单项选择题

My son is ill. I have to _______ him at home.

A． look after
B． look for
C． look at
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单项选择题
My brother _______ for nearly five years.
A． has been in the army
B． has joined the army
C． became a soldier
单项选择题
_______ important information it is!
A． What a
B． What
C． How
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