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The first use of atomic weapons was in 1945.And their power

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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
C

此题考查时态的用法。前面讲1945年首次使用原子弹,而后面一句无确定的过去时间,但ever since确定了应选C项,因为ever since和完成时态连用,指的是“从那以后”,即since 1945。