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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．wasC．has beenD．had been
    C
    句中的since为副词，表示“从过去某时起一直到现在”，它通常要与现在完成时连用。
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