单项选择题

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

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

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单项选择题
All the students were excited at the （） of a weekend sports competition.

A．opinion
B．view
C．thought
D．idea
单项选择题
I believe reserves of coal here （） to last for fifty years.

A．efficient
B．sufficient
C．proficient
D．effective
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