Science and technology have ___A_____ in important ways to the improvement oA) attachedB) assistedC) contributedD) witnessed为什么不能选A?

问题描述:

Science and technology have ___A_____ in important ways to the improvement o
A) attached
B) assisted
C) contributed
D) witnessed
为什么不能选A?

C) contributed
v.有助于,贡献(contribute的过去分词)
adj.贡献的,分配的;已缴入的