题目

Hi, Tina ,we’re going to Sam’s house to celebrate his graduation. Would you like to      ?   —Great! Let’s go. A．come up   B．come on   C．come out  D．come along 答案：D7．有一个数值转换器，其工作原理如图所示，若输入-2，则输出的结果是（　　）A．-8B．-6C．-4D．-2