17．If you want to do the experiment again，you'd better be more careful         you made a mistake．（　�。�
A．whenB．whyC．whereD．that

分析 如果你想再做一次實驗，那么你最好在你犯錯誤的地方更加小心．

解答 答案：C 
題干中you made a mistake位于形容詞careful后，是一個狀語從句；句中again表示再一次，說明前面的實驗中犯了錯誤，那么這一次要做上次犯錯誤的地方多加小心，是一個地點狀語從句．故選C．

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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