问题
选择题
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
答案：D
effort (作可数名词用) 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？)