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

发布时间：2020-08-17 12:46:02

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：句中的since为副词，表示“从过去某时起一直到现在”，它通常要与现在完成时连用。
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