单项选择题

Not until yesterday ______ anything about the project that will be completed soon.

A．did I learn
B．have I learnt
C．I learnt
D．that I learnt
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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
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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