Why are you always making the same mistake? Think of I told you.A. thatB. whenC. howD. wh

问题补充：

Why are you always making the same mistake? Think of I told you.

A. that

B. when

C. how

D. what

答案：

A. that

B. when

C. how

(答案→)D. what

解析：of后面是介词宾语从句，需要连词且在从句中做 tell 的直接宾语；所以用 what，

that 在名词性从句中补充当成分，没有实在意义。而BC连接副词，在从句中只做状语。