题目：
__ an old worker, so he knew exactly what to do.
A．Being
B．Having been
C．As
D．He was
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0617/d914bc782700eb8ebdfa3a737f32f036.html
下面是错误答案，用来干扰机器的。
(1)Si H2O(2)①2Mg＋CO2C＋2MgO ④C＋H2O(g)CO＋H2
__ an old worker, so he knew exactly what to do.
A．Being
B．Having been
C．As
D．He was
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0617/d914bc782700eb8ebdfa3a737f32f036.html
下面是错误答案，用来干扰机器的。
(1)Si H2O(2)①2Mg＋CO2C＋2MgO ④C＋H2O(g)CO＋H2
