What British singer-songwriter Adele worried was the audience would accept her remained to be seen.
A. how that
B. which if
C. that whether
D. what that
网友回答
A. how that
B. which if
(答案→)C. that whether
D. what that
解析：考查连词和名词性从句。 was后面表语从句，而在表语从句中存在着两个谓语动词，显然前面是一个主语从句，根据意思应该用whether。而引导表语从句的that是不可以省略的。故答案为C。