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    1．However，It was in war          they found their greatest use．（　　）
    A．whereB．whichC．howD．that

    分析 然而，他们是在战争中发现的他们的巨大用途．

    解答 答案：D．
    分析句子结构可知，本句如果去掉it was和所填的空，将in war移到句末，仍然构成一个完整的句子，由此可知，此处为强调句型，强调的是地点状语；故选D．

    点评 强调句的基本句型：It is/was+被强调的句子成分+that/who+句子的其他成分．
    It was Doctor Smith that （who） gave us a lecture last week．上周给我们讲课的正是史密斯博士．
    It was last summer that my daughter learned to swim．正是去年夏天我女儿学习游泳了．

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