The first use of atomic weapons was in 1945, and their power increased enormously ever sin

发布时间：2020-08-17 11:37:26


The first use of atomic weapons was in 1945, and their power     increased enormously ever since.
A. is
B. was
C. has been
D. had been.

网友回答

A. is
B. was
(答案→)C. has been
D. had been.
解析：and 连接的是前后两个句子。第二句中的their power 为主语。
以上问题属网友观点，不代表本站立场，仅供参考！