单项选择题

That they have cheated the boys ______ now clear to us all.

A. is
B. are
C. was
D. were
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单项选择题
In England, people put their ______ first.
A. given names
B. full names
C. family names
D. English names
单项选择题
The trouble with such resources as coal，oil and gas ______ that they are not renewable．
A．has been
B．are
C．have been
D．is
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