单项选择题

This is the microscope（）which we have had so much trouble.

A．at
B．from
C．of
D．with

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单项选择题
Three new buildings（）on the campus by the end of this year.

A．will be built
B．are going to be built
C．will have been built
D．have been built
单项选择题
Nobody knew what this guy（）all these years.

A．had been doing
B．have being doing
C．was doing
D．has been doing
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