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
During the press conference, the chairman remained silent when ______ his opinion about the strike.
A．asking
B．being asked
C．asked
D．to be asked
单项选择题
______ her surprise, Miss Wang found nobody in the classroom.
A．At
B．To
C．For
D．With
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