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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Most matter ______ three states: solid, liquid and gas.
A． have
B． has
C． are
单项选择题
Mary told me that the story book must ______ to the library in two days.
A． be return
B． be returned
C． been returned
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