单项选择题

A．He already knew about the problem.
B．There’’s nothing wrong with the washing machine.
C．Someone has started fixing the washing machine.
D．No one complained about the washing machine today.
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单项选择题
The passage is mainly concerned with________.
A．application of analogy in studying juvenile delinquency
B．a research design concerning juvenile delinquency
C．significance of juvenile delinquency
D．an extensive survey of researches in juvenile delinquency
单项选择题
American colleges and universities failed to graduate half of their four-year degree candidates because________.
A．most of them lack high-quality faculties
B．the interests of most faculty members lie in research
C．there are not enough incentives for students to study hard
D．they attach greater importance to research and publication than to teaching
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