单项选择题

Mr Chen complained about the（）air-conditioner he bought from the company.

A. inefficient
B. defective
C. ineffective
D. deficient

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单项选择题
The old musician decided to move to her country home（）her advanced age and poor health.

A. with regard to
B. by virtue of
C. on account of
D. at the verge of
单项选择题
It was a long time before the cut on my hand（）completely.

A. healed
B. cured
C. improved
D. recovered
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