题目

I wanted to know _________, but no one would like to tell me. A．what did the old man sayB．how did the old man comeC．whether the old man would come D．who the old man went 答案：C解析:略若a、b互为相反数，c、d互为倒数，p的绝对值等于2，则关于x的方程的解为　　　　　　　　。