According to a new survey carried out by an American university, learning______ second language can result in_______ increase in the power to learn your native tongue.
A.a; the
B.不填; the
C.a; an
D.the; an
网友回答
C解析“a second language”泛指一们第二外语; 后面的increase作名词讲, 是可数名词, 前面需加不定冠词an。