The earthquake in Japan was so violent___cause a series of explosions of the nuclear reactions.A.to B that c as to D as that

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The earthquake in Japan was so violent___cause a series of explosions of the nuclear reactions.
A.to B that c as to D as that

so as to
以便;以致
因为后面并不是从句,是个不定式结果状语.
如果改成:so violent () it cause .
这就是从句了,就应该用:B that

首先不能选B
因为要是B的话就引导了结果状语从句 而THAT后面又缺少主语 所以错误
AS TO 也是引出结果 刚好后面跟动词不定式
没有AS THAT 的结构

Pick C.