单项选择题

Because of the reduction of air pollution, this city now is a good place ______.

A．where to live
B．which to live
C．to live
D．to be lived
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单项选择题
Linda feels exhausted because she ______ so many visitors today.
A．has been having
B．had been having
C．was having
D．had had
单项选择题
Not for a moment ______ the troth of your explanation about the event.
A．we have doubted
B．did we doubt
C．we had doubted
D．doubted we
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