单项选择题

If you can"t solve this problem, why not try ______ help

A．to ask for
B．asking for
C．to ask
D．asking
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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
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
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