单项选择题

Grey wolves take good care of the young.

A． Right.
B． Wrong.
C． Doesn't say.
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单项选择题
At the age of eleven, my grandfather ______ to work in a factory.
A． began
B． has begun
C． will begin
单项选择题
Most matter ______ three states: solid, liquid and gas.
A． have
B． has
C． are
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