题目

— Did Jim ______ in the swimming pool yesterday? —Yes, he did. A. has fun      B. had fun  C. have a fun     D. have fun 答案：D8．下列关于家庭电路的说法中正确的是（　　）A．家庭电路中电流过大，一定是电路发生了短路B．家庭电路的开关，一定要接在火线上C．使用试电笔时，手指不能碰到笔尾金属体，以免发生触电事故D．空气开关跳闸后，应立即合上