Our parents always tell us to believe inwe do if we want to succeed.A. whyB. howC. whatD.

问题补充：

Our parents always tell us to believe inwe do if we want to succeed.

A. why

B. how

C. what

D. which

答案：

A. why

B. how

(答案→)C. what

D. which

解析：句意：我们的父母总是让我们相信我们做的事情，如果我们想要成功的话。这里介词in后面是宾语从句，宾语从句中缺少宾语，用what引导宾语从句，所以选C。