4．Now she is considering taking some weight-loss pills，_______ she thinks will help her become slim．（　�。�
A．whichB．thatC．whatD．who

分析 她現(xiàn)在正在考慮服用一些減肥藥，她認為這些藥可以幫她變苗條．

解答 答案：A
句中she thinks will help her become slim修飾名詞pills，是一個非限制性定語從句；從句中she thinks是插入語，不影響句子結(jié)構(gòu)；從句缺少主語，且指代的是先行詞是pills，要用which來引導．故選A．

點評 定語從句是用來修飾名詞的形容詞性從句，相當于一個形容詞．連接定語從句的引導詞分為關(guān)系代詞和關(guān)系副詞，關(guān)系代詞在從句中要作主語或賓語；關(guān)系副詞在從句中作狀語．這也是選擇關(guān)系詞的一個判斷方法．

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