题目

—It is strange that Dave didn’t respond________any of my e??mails. —Something must have happened to him. A．on B．with C．for                                D．to 答案：D 解析: 略一个真分数的分子和分母相差102，若这个分数的分子和分母都加上23，所得的新分数约分后得14，这个真分数是1111311113．