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垄断竞争旅游市场

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旅游重游率

旅游企业开拓旅游市场最好采用无差异市场策略,可以提高市场占有率

A. 对
B. 错

By the end of next year, we _____more than five thousand new words.

A. have learned
B. will learn
C. will have learned
D. have been leaming

Even if his famous father in person tomorrow , it too late todo anything.

A. will arrive; is
B. should arrive; were
C. arrives;will be
D. arrives ; would be