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There are different forms of energy ,___come from the sun.A

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There are different forms of energy ,___come from the sun.A that B most of that C most of them
D most of which ,为什么选D呢?为什么不选C,是不是因为them只能是指人,不能指物?
D 这是一个非限制性定语从句.
如果,___come from the sun.前面加上一个并列连词and 的话,就是并列句了可以选择C.
There are different forms of energy ,and __C _come from the sun.