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
There me two maps on the wall: one is a map of China, and ______ is a map of the world.
A．other
B．another
C．the other
D．the others
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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