问题补充：
单选题Maryhadtaken_____toseethatherguestshadeverythingthattheycouldpossiblywant.A.effortsB.painsC.attemptsD.endeavors
答案：
B解析take pains to do sth.下苦功夫做某事：Im grateful because you have taken pains to show me how to do the work.
600字范文，内容丰富有趣，生活中的好帮手！
