问题
选择题
The single most important factor ____ contributes to success is _____ you do every single day．
A．that; that
B．which; what
C．which; what
D．that; what
答案
D
从句子结构分析,第一个空考查定语从句的关系词,因先行词前有形容词最高级修饰且指事物故只用that引导;第二个空跟在be动词后,表明是一个表语从句,用do后缺少宾语,因此只能由what来引导。