单项选择题

The students in the dormitories were forbidden, unless they had special pass, ______ after 11 pm.

A. staying out
B. stay out
C. from staying out
D. to stay out
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单项选择题
The newly-built municipal museum seems ______ enough to last a hundred years.
A. steady
B. substantial
C. sophisticated
D. spacious
单项选择题
Another natural ______ that contributes to the welfare of the country is water.
A. source
B. mineral
C. power
D. resource
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