15. It was a great _____ for him to be pleasant to people he didn't like.

  A. attempt B. trouble C. power D. effort

  [答案] D. effort.

  [注释] effort (作可数名词用) (=vigorous attempt) 努力的尝试：Does it require a great effort of will to give up smoking? (戒烟需要坚强的毅力吗？)

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