You don not have to be a genius to make____difference;hard work can do____certain extent make up

问题描述:

You don not have to be a genius to make____difference;hard work can do____certain extent make up
for a lack of intelligence
A/:a B;a,/ C a;a D/ /

答案是 C.确定吗?这2处都应该加不定冠词,没错的!