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
He got a message from Miss Zhang ______ Professor Wang couldn't see him the following day.
A．which
B．whom
C．that
D．what
单项选择题
She wanted to know ______ child it was on the grass.
A．that
B．whose
C．what
D．whom
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