单选题
It is well known that employees do not contribute enough ______ the plans. A. from B. to C. with D. at
【正确答案】
B
【答案解析】中级问题 4个选项都是介词。如果不能从后面的名词来判断答案，那么就要考虑是不是和前面的动词构成固定搭配。contribute A to B向B提供A。记住“contribute to+名词”也能以不及物 动词的形式使用。 [高频词语] it is (well) known that …众所周知……