问题补充:
单选题Onturningonthecomputer,.A.Mum told me to have supper.B.a game appeared on the screen.C.there was something wrong with the mouseD.I found a strange E-mail.
答案:
D解析这题考察句子结构,on doing“一…就”,doing的逻辑主语和句子的主语是一致的,应该是I做主语,选D,句意是:一关掉电脑,我就发现一个奇怪的电子邮件。选D。