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___inreased enormously ever since.
A.is B.was C.has been D.had been
我选了C
是因为前后两句时态并列都是过去吗?

ever since:表从那时到现在,或自从的意思,其通常与完成时态连用,因为主句表达的是过去的内容,所以这里要用过去完成时,自从那时起,那时指的是The first use of atomic weapons was in 1945.

The first use of atomic weapons was in 1945,and their power_ 英译汉两句话1.The first use of atomic weapons was in 1945,and the The first use of nuclear weapons was in 1945 and their power （）the first to use nuclear weapons ________will China be the first to use nuclear weapons Their use was limited by laws,the first of which dates back Use principles of atomic structure,bonding,and/or intermolec atomic weapons是什么意思? China will not be the first to use nuclear weapons under any Was the cost of the Civil War in terms of people and their s The government has the use of chemical weapons.A.bannerB.ban their company is among the first ones to make use of the----