单项选择题

The ridge ______ on a person's fingers does not change with growth and is not affected by severe damage.

A. construction
B. structure
C. location
D. position
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单项选择题
Something unexpected has turned
A. up
B. back
C. out
D. around
单项选择题
The indoor swimming pool seems to be a great more luxurious than______.
A. being necessary
B. to be necessary
C. is necessary
D. it is necessary
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