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
Mary told me that the story book must ______ to the library in two days.
A．be return
B．be returned
C．been returned
单项选择题
We ______ to be here at six o'clock.
A．were told
B．told
C．are told
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