正确答案B,句意是“众所周知,诚实和辛苦的工作有助于我们成功和幸福.
contribute to:
是…的部分原因；促成,有助于,起作用：
例句:Various factors contributed to his downfall.
多种因素的作用导致了他的倒台.
Your suggestion will contribute to solving the problem.
你的建议将有助于解决这个问题.
attend to
1.倾听,仔细听；注意；留意；听取：
例句:to attend to one’s advice
听取某人的意见,听某人的话
Attend to me,children.
孩子们,仔细听我讲.
2.照料,照顾；料理；护理；看护；关怀：
例句:to attend to a customer
接待(或招呼)顾客Mother attended to the baby while I went to the dance.
我去跳舞时妈妈照管了婴儿.
3.专心于；致力于；办理；安排：
例句:to attend to one's duties
做好自己的工作,尽职
Don’t worry,everything will be attended to in good time!
别着急,每件事都会得到及时处理.