单项选择题

Their sole fault was a failure to recognize all the factors involved.

A．maximum
B．usual
C．initial
D．only
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单项选择题
The nursery is bright and cheerful.()

A. pleasant
B. colorful
C. fashionable
D. different
单项选择题
The most crucial problem any economic system faces is how to use its scarce resources.()

A. puzzling
B. difficult
C. terrifying
D. urgent
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