单项选择题

When and where the new hospital will he built ______ a mystery.

A. to remain
B. remains
C. remain
D. is remaining
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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
单项选择题
The police were given an order that the stolen documents must he recovered at all
A. accounts

B. conditions
C. payments

D. costs
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