单项选择题

Textile is the chief source of wealth in this area, wool______by far the biggest industry.

A. is
B. been
C. be
D. being
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单项选择题
The longer the miners are trapped in the tunnel,______to survive.
A. the slimmer chance is
B. slimmer is the chance
C. the chance is slimmer
D. the slimmer the chance is
单项选择题
My dog______from home for three days now, and I am so worried about its safety.
A. has been missed
B. has been missing
C. had been missing
D. was missed
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