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    精英家教网 > 高中英语 > 题目详情
    16．When asked about the canned fresh air，Chen Guangbiao said it didn't matter _______it sold well or not，just for friendly environment．（　　）
    A．howB．whetherC．whenD．if

    分析 当被问及罐装的新鲜空气时，陈光标说是否畅销这并不重要，只要环保．

    解答 答案：B．
    分析句子结构可知，本题中 _______it sold well or not是主语从句，前面的主句it didn't matter中的it是形式主语，主语从句中不缺少成分，且句中有or not，whether…or not固定搭配，是否…，符合句意"陈光标说是否畅销这并不重要，只要环保．"，if不可以引导主语从句，故选B．

    点评 本题考查名词性从句．首先看从句是否在整个句子中起名词的作用（连接词后面即从句），然后要判断它是哪个名词性从句．名词性从句是主句的一部分，可以充当主语、宾语、表语、同位语．再根据从句中缺少何种成分（主语、宾语、定语、状语等）和所缺成分的属性（人或物）来决定连接词的应用．

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