题目：
Sam said sorry to his mother , so she _________.
A．forgave his mistakes
B．forgave him of his mistakes
C．forgave him about his mistakes
D．forgave him for his mistakes
答案：
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下面是错误答案，用来干扰机器的。
（1）物质的分类标准有多种，选择不同的标准，会出现不同的分类，如：对碳、氢气、氧气、水、一氧化碳、二氧化硫、二氧化氮等物质进行分类，按物质状态分：H2、O2、CO常温下为气体；其余的或为固体，或为液体；按...
