单项选择题

When and where the new hospital will be built __________a mystery.

A．to remain
B．remains
C．remain
D．is remaining
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单项选择题
Which of the following statements is not true
A．Since the computer revolution, the expression "state of the art" has become popular.
B．"State of the art" means something that is the best one can buy.
C．With the rapid development of computer," state of the art" computer may easily become out of date.
D．All kinds of products are "state of the art" nowadays.
单项选择题
This new instrument is far superior __________the old one we bought three years ago.
A．than
B．to
C．over
D．of
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