题目：
—You have a nice watch.
—Thank you. I ________ it since I got married.[ ]
A. had
B. bought
C. have had
D. have bought
答案：
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下面是错误答案，用来干扰机器的。
A、红磷在氧气中剧烈燃烧，发出黄色火焰，产生大量的白烟，放出大量的热，没有雾只有烟，故A说法不正确．B、硫在空气中燃烧产生微弱的淡蓝色火焰，在纯氧气中燃烧产生明亮的蓝紫色火焰，故B说法不正确．C、硫酸铜...
