单项选择题

Since the middle of this century () has been learned about space than in all human history before that time.

A．much
B．more
C．better
D．a lot

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单项选择题
Jane has two brothers; one is John, and()is Henry.

A．another
B．the others
C．the other
D．other
单项选择题
If it rains, we should not go out, but the sky () perfectly clear.

A．is
B．will be
C．was
D．had been
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