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    精英家教网 > 高中英语 > 题目详情
    12．It is a challenging task to learn English．

    分析 学习英语是个富有挑战性的任务．

    解答 答案：It
    解析：分析句子结构可知本句横线处缺句子的主语，而根据句意可知实际上句子的主语是后面的动词不定式to learn English"学习英语"，因此本句该使用It作形式主语．之所以要用It作形式主语、动词不定式作真正主语，是为了避免句子出现"头重脚轻"的现象．

    点评 本题考查主谓一致，做此类题目时要先分析句子的结构，确定句子所缺成分及该由什么来充当．

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