Mary had taken to see that her guests had everything that they could possibly want.
A. efforts
B. pains
C. attempts
D. endeavors
网友回答
A. efforts
(答案→)B. pains
C. attempts
D. endeavors
解析： take pains to do sth.下苦功夫做某事：I'm grateful because you have taken pains to show me how to do the work.