The earthquake in Japan measuring 9.0 on the Richter Scale was so violent cause a series

问题补充：

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

答案：

A. to

B. that

(答案→)C. as to

D. as that

解析：考查句型搭配。 因为句中有so violent故选择B， C。 So ……that+ 完整句子，so ……as to do ，故选择C