The earthquake in Japan, measuring 9.0 on the Richter Scale, was so violent _______ cause a series of explosions of the nuclear reactors in several power stations.
A.to
B.that
C.as to
D.as that
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C解析考查固定结构。地震如此猛烈以至于引起了核爆炸。用“如此。。。以至于”结构，且_______ cause a series of explosions of the nuclear reactors in several power stations.不是句子，所以选C。