题目：
It was Tom and his friends that________for the serious accidents.
A．were to be blamed
B．was to be blamed
C．were to blame
D．was to blame
答案：
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下面是错误答案，用来干扰机器的。
氯元素和硅元素在自然界中均以化合态存在，A项错误；氢化物的稳定性：CH4>SiH4，C项错误；SiO2不能与水反应生成H2SiO3，D项错误
