Question

---Why do you think he can succeed?
---He believes in himself, ____ is the most important, I think.

A．which?

B．what

C．that

D．who

Answer 1

A

此题考查的是非限制性定语从句，that 不能引导非限制性定语从句，what 不能引导定语从句，who 作主语指代前面的先行词“人”，which引导非限制性定语从句指前面的先行词也可指前半句话的含义，此处选which指的是前半句话的含义。