单项选择题

Obviously these are all factors affecting smooth operation, but the underlying problem is still to be identified.

A．operational
B．fundamental
C．operating
D．underneath
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单项选择题
The committee reported its findings after a thorough investigation.
A．things that are found
B．decisions
C．results of an enquiry
D．files
单项选择题
Growing economic problems were highlighted by a slowdown in oil output.
A．accounted for
B．worked out
C．made prominent
D．taken for granted
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