单项选择题

If you will buy one box at the regular price, you would receive another one at no extra cost.

A．If
B．will buy
C．another one
D．no
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Sarah said she heard someone in the classroom, but when we looked we didn't find someone.
A．she heard
B．someone
C．we didn't
D．find someone
单项选择题
It is extremely important for an engineer to know to use a computer.
A．It is
B．extremely
C．for
D．to know to use a
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