题目

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