Why are you always making the same mistake? Think of _____ I told you.
A. that B. when C. how D. what
Why are you always making the same mistake? Think of _____ I told you.
A. that B. when C. how D. what
D
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。