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Building a reservoir indeed costs us a great amount of money, but in the long run it is greatly ________ to us, especially when we meet drought days.


  1. A.
    beneficial
  2. B.
    influential
  3. C.
    commercial
  4. D.
    efficient
A
beneficial“有益的”;influential“有影响的”,后接介词on; commercial“商业的”;efficient“有效率的”。
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Xinhua Sept.25,2008

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       If successful, the mission would be of great significance to the country’s future plans to build a space lab and a space station, said ZhangJianqi, deputy chief commander of the manned space project.

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       C.Sports report.                 D.Advertisement

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