20．_I do almost everything for my son，but he still fails me．
一I'm sorry to say that's ______you are mistaken．（　�。�
A．howB．whyC．whatD．where

分析 -我?guī)缀鯙槲覂鹤幼隽怂械氖虑�，但是他仍然令我失�。?br />-很遺憾地告訴你這正是你錯誤的額地方．

解答 答案是D．考查名詞性從句，分析句子可知"you are mistaken"是一個表語從句，從句是主系表結(jié)構(gòu)的句子，根據(jù)句意：這正是你錯誤所在，所以用where來引導，故答案選D．

點評 名詞性從句一直是高考考查的熱點，近幾年的高考題主要考察在具體語境中對what和that的辨析，此外，也要求學生對定語從句和名詞性從句有清晰的辨認． 首先我們要判斷它是哪個名詞性從句．名詞性從句是主句的一部分，可以充當主語、賓語、表語、同位語．就是說，如果我們能判斷出某個從句是某個主句的主語、賓語、表語或同位語，

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