第17题: [单项选择]I think I was at school, _______ I was staying with a friend during the vacation when I heard the news. A. or else B. and then C. or so D. even so 参考答案:A 答案解析:or else作“否则,不然”讲,表示一个与前面所述相反的条件。例如:ive it back to me or else I’lltell your teacher about it.还给我,否则我就