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

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.

1. A.
   to
2. B.
   that
3. C.
   as to
4. D.
   as that

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.

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.