单项选择题

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
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It is extremely important for an engineer to know to use a computer.
A．It is
B．extremely
C．for
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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
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