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
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单项选择题
Hurry up. My mother ______ for us in the zoo.
A．must wait
B．should be waiting
C．must be waiting
单项选择题
Most matter ______ three states: solid, liquid and gas.
A．have
B．has
C．are
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