单项选择题

Before we leave, make sure ______ there is some paper in your bag.

A．which
B．what
C．that
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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
单项选择题
The policeman asked the boy his name and how old he ______.
A．was
B．had
C．has been
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