The first use of nuclear weapons was in 1945 and their power
The first use of nuclear weapons was in 1945 and their power ________ increased ever since.
A is B was C has been
D had been
此题为什么答案选C, 请分析一下,谢谢.
A is B was C has been
D had been
此题为什么答案选C, 请分析一下,谢谢.
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