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
Not for a moment _______the truth of your explanation about the event.
A． we have doubted
B． did we doubt
C． we had doubted
D． doubted we
单项选择题
Jane always enjoys _______to popular music at home on Friday evenings.
A． listening
B． being listening
C． to be listening
D． to listen
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