题目

Sarah had her washing machine repaired the day before yesterday,           _______ she?      A. had          B. did              C. hadn't              D. didn't 答案：A 解析: 萨拉几天前请人修了洗衣机，是吗？根据关键词had her washing machine repaired the day before yesterday可知应用一般过去时。 在函数y＝(a为常数)的图象上有三点(x1，y1)，(x2，y2)，(x3，y3)且x1＜x2＜0＜x3，则函数y1，y2，y3的大小关系是 [　　] A．y2＜y3＜y1 B．y3＜y2＜y1 C．y1＜y2＜y3 D．y3＜y1＜y2