单项选择题

There is one suggestion that the footsteps of crowds walking the streets in major cities could __energy.

A．assemble
B． gather
C． generate
D．yield
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单项选择题
The medical record shows that it was the drag, not the disease, __ him several years ago.
A．that
B．finally
C．the effects of which
D． the effect of which
单项选择题
We regret __ you that the computers you ordered are out of stock.
A．informing
B．to inform
C．having informed
D． m have informed
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