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    16．All the electric equipment ______ will be fixed in the office ______ great importance to us．（　　）
    A．that； are ofB．what； is ofC．that； is ofD．what； are of

    分析 所有在办公室里安装的电气设备对我们都很重要．

    解答 C 考查定语从句．本句被修饰的先行词是equipment，在从句中做主语用that来引导；又因为equipment做设备讲是不可数名词，所以谓语动词用is．故答案选C．

    点评 定语从句又称为形容词性从句，综观历年高考试题，我们可以发现该语法项目是测试中的热点与难点，解定语从句的题目首先要知道哪一句是主句，哪一句是从句，被修饰的词是谁，从句中的句子成分缺失什么，根据缺失成分的不同从而选出相对应的关系代词或者关系副词，从而选出正确的答案，解题的关键是从句句子的成分分析．

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