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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单项选择题
On her way to the supermarket yesterday morning Mary met an old friend and stopped talking with him for quite a while.
A．On her way
B．met
C．stopped talking
D．while
单项选择题
Everyone who takes the examination will receive their score report in six weeks.
A．who
B．takes
C．their
D．in six weeks
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