单项选择题

All the workers ______ together and wrote a letter to the head of the company.

A．got
B．put
C．took
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单项选择题
The policeman asked the boy his name and how old he ______.
A．was
B．had
C．has been
单项选择题
When we arrived at the railway station, they were ______ there.
A．yet
B．once
C．already
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