Question

What British singer-songwriter Adele worried was ___________

Answer 1

C

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。