单项选择题

The old lady has developed a ______ cough which cannot be cured completely in a short time.

A. perpetual
B. permanent
C. chronic
D. sustained
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单项选择题
He is an artist with seemingly unlimited ______.
A. creativity
B. creature
C. creation
D. creator
单项选择题
The back garden of our house contains a lawn, ______ very pleasant to sit on in summer.
A. which is
B. which it is
C. it is
D. where it is
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