单项选择题

Not until my British friend came to China______ how densely populated the country is.

A．did he realize
B．he didn't realize
C．he realized
D．he could realize
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单项选择题
According to the passage, computers play an essential role in______.
A．automation
B．mathematical computations
C．traffic control
D．the development of mathematical theory
单项选择题
I don't believe that your sister can speak two foreign languages,______
A．do I
B．can't she
C．don't I
D．can she
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