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 |
相关知识点
推荐套卷
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 |