问题
选择题
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
答案
答案：C
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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
答案：C