单项选择题
A.at least
B.at most
C.at last
D.at the cost
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单项选择题
We can infer from the passage that______.
A.computer networking will be helpful in the food industry
B.24-hour supermarkets are not very common
C.few shopping centers are three-shift open at any hour
D.24-hour restaurants are not in practice in the great business capitals
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填空题
F
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E
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