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
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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
单项选择题
Thousands of products_______ from crude oil are now in daily use.
A． to make
B． be made
C． making
D． made
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