题目

如果a+b＜0,＞0,那么这两个数（ ） A . 都是正数 B . 符号无法确定 C . 一正一负 D . 都是负数 答案：DI was        in the middle of my call because I had no more coins to put in the box.A．cut offB．broken inC．hung upD．put down