It was a great _____ for him to be pleasant to people he didn't like.
A. attempt B. trouble C. power D. effort
It was a great _____ for him to be pleasant to people he didn't like.
A. attempt B. trouble C. power D. effort
D
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?)