单项选择题

"Do you mind ______ "
"Go ahead. I don't mind."

A．turning on the fan
B．I turn on the fan
C．if I turn on the fan
D．to turn on the fan
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单项选择题
Professor Jeffrey's lecture on the recycling of waste paper and other garbage will show ______ can still be improved.
A．that the municipal authorities have done
B．how those the municipal authorities have done
C．how what the municipal authorities have done
D．that how the municipal authorities have done
单项选择题
I got a new battery for my recorder only last week, but it seems to have ______ already.
A．worn out
B．run down
C．knocked off
D．gone off
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