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20．______ I can't understand is _______ the illegal cooking oil，mostly made from discarded （被棄的）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廚房廢棄垃圾提煉而成的地溝油為什么不能有效地檢測和識別．

解答 答案：D
題干中I can't understand是作is的主語，是一個主語從句；從句中understand缺少賓語，要用連接代詞；后面的句子是作表語，是一個表語從句；句意表達的是我不能理解的事情，應該是想知道原因，故選D．

點評 從屬連詞是連詞的一種，用來引導名詞性從句和狀語從句．大致可分為三大類：that（無詞義，不做成分）if，whether （表達是否的意義，但不做句子成分）； 連接代詞：who，whom，whose，what，which，whatever，whoever，whichever（有詞義，在句子中可作主語、表語、賓語）；連接副詞：when，where，why，how，how many，how long，how far，however，whenever，wherever （有詞義，作從句的狀語）．學習時，要注意區(qū)分和掌握．

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