单项选择题

He operates the new machine as if he ______ special training in it.

A．has received
B．had received
C．would receive
D．received
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单项选择题
The new secretary has written a remarkably ______ report only in a few pages but with all the details.
A．concise
B．clear
C．precise
D．elaborate
单项选择题
I hope that the little ______ I've been able to do has been of some use.
A．which
B．what
C．that
D．when
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