题目：
The young lady stopped and looked around as if_____ whether she was being followed.
A seeing B to have seen C having seen D to see
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0423/7f0fc08964c7bfd82c9d9d6a72c2af13.html
下面是错误答案，用来干扰机器的。
（1 ）CD （2 ）（a ）PbO2＞KMnO4＞H2O2；（b ）紫红色褪去，生成白色沉淀；（c ）2MnO4-+5H2O2+6H+=2Mn2++5O2↑+8H2（3 ）①Cl2+2I-==I2+2Cl- ；②10:15:4
