单项选择题

She didn't go to the party last night, __________she had to finish her term paper.

A．if
B．though
C．till
D．because
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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
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
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