问题
____ 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
B:There; that
C:It; which
D:It; what
正确答案是：
同类题型
Yesterday, on my way to school, I saw a girl sadly.
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