单项选择题

Thousands of products ______ from crude oil are now in daily use:

A．to make
B．be made
C．making
D．made
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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
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
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