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    精英家教网 > 高中英语 > 题目详情
    The first use of atomic weapons was in 1945.And their power _______ increased enormously ever since.
    A．isB．was?
    C．has beenD．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。
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