单项选择题

_______ we could afford it, we wouldn't go abroad for our holidays.

A．Provided
B．Even if
C．Whatever
D．As if
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单项选择题
While we axe making more use of nuclear power to meet the energy demand we should never neglect the _______ effect it can have on our living environment.
A．contrary
B．positive
C．negative
D．extensive
单项选择题
I doubt whether he can _______ his efforts much longer as he looks very tired.
A．keep up
B．keep on
C．keep in
D．keep at
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