单项选择题

Fashion designers are rarely concerned with vital things like warmth, comfort and ______.

A. stability
B. capability
C. durability
D. availability
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单项选择题
He operates the new machine as if he ______ special training in it.
A. has received
B. had received
C. would receive
D. received
单项选择题
He had hardly finished the article ______ the light went out.
A. as
B. until
C. than
D. when
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