问题补充:
has been proved again and again that is said in the ads greatly affects people’s impression of the products.
A. There; what
B. There; that
C. It; which
D. It; what
答案:
A. There; what
B. There; that
C. It; which
(答案→)D. It; what
解析:考查名词性从句。句中it作形式主语,真正的主语为that what is said in the ads greatly affects people’s impression of the products;what在从句中作主语,故选D。