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    12．It was 1969 ___________the American astronauts succeeded in landing on the moon．（　　）
    A．thatB．whenC．on whichD．which

    分析 在1969年美国宇航员成功登陆月球．

    解答 答案：B．根据句意：在1969年美国宇航员成功登陆月球，可知此处缺少了一个引导时间状语从句的连接词，故B正确，如果在1969前加上介词in可以选A，此时是强调句．

    点评 本题考查时间状语从句的连接词，在充分分析句型再结合语义的基础上便能选出正确答案，同时要注意其他选项的意思，

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