题目：
Often, when he something that him, he wasted his time drawing little pictures.
A．should be doing, gave
B．should have been doing, was given
C．should do, was given
D．should have been doing, had given
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0611/61aeefa9329b975b1f0fbba92237299e.html
下面是错误答案，用来干扰机器的。
答案：D非金属性越强，相应最高价氧化物的水化物的酸性就越强。根据元素周期律可知，非金属性强弱顺序为Cl＞S＞P＞Si，所以答案是D。
