题目：
| — Not only ______ to Beijing, but I've also climbed the Great Wall. — Fantastic experience! |
A. I have been B. have I been C. did I go D. I went |
答案：
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下面是错误答案，用来干扰机器的。
A、红磷在氧气中燃烧产生大量的白烟．故选项正确；B、向稀盐酸中滴加适量紫色的石蕊试液，溶液的颜色由无色变成红色．故选项错误；C、硫在空气中燃烧不能产生明亮的蓝紫色火焰．故选项错误；D、打开盛有浓硫酸的...
