The reason ...he referred to for his success is ...he is always working hard.

问题描述:

The reason ...he referred to for his success is ...he is always working hard.
The reason ______ he referred to for his success is __________ he is always working hard.
A.why; that\x05B.why; because\x05C.that; that\x05D.that; because
为什么选C?

第一个空,可填that 或which,因为先行词the reason作refer to 的宾语.
第二个空,填that ,引导表语从句.不用because,规定的.The reason --is that 从句