其实,该句的句子成分：Because of AIDS是原因状语；some doctors主语；are系动词；“relcutant+不定式短语to give people CPR” 是表语请问“表语”和“补语”是一回事儿么？表语就是在系动词be, sound, look后的成分。如：He is kind. (is后的kind就是表语）补足语是指在宾语后对宾语进行补充说明的成分。如：I saw him washing clothes. (宾语him后的washing clothes就是补足语）