题目内容

20．______ I can't understand is _______ the illegal cooking oil，mostly made from discarded （被弃的）kitchen waste，is difficult to detect and identify efficiently．（　　）
A．Why…thatB．That…thatC．What…becauseD．What…why

分析 我不明白的是大部分由厨房废弃垃圾提炼而成的地沟油为什么不能有效地检测和识别．

解答 答案：D
题干中I can't understand是作is的主语，是一个主语从句；从句中understand缺少宾语，要用连接代词；后面的句子是作表语，是一个表语从句；句意表达的是我不能理解的事情，应该是想知道原因，故选D．

点评 从属连词是连词的一种，用来引导名词性从句和状语从句．大致可分为三大类：that（无词义，不做成分）if，whether （表达是否的意义，但不做句子成分）； 连接代词：who，whom，whose，what，which，whatever，whoever，whichever（有词义，在句子中可作主语、表语、宾语）；连接副词：when，where，why，how，how many，how long，how far，however，whenever，wherever （有词义，作从句的状语）．学习时，要注意区分和掌握．

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