单项选择题

The conference__________ in Beijing next week is bound to be a great success.

A．holding
B．being held
C．to hold
D．to be held
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单项选择题
For years, doctors__________ millions of patients' lives with the help of microscopes.
A．have saved
B．are saving
C．will save
D．were saving
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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