16．________ I can't understand is ________ he wants to change his mind．（　�。�
A．That； thatB．What； whyC．Which； whatD．What； 不填

分析 我不能理解的是他為什么要改變主意．

解答 B 考查名詞性從句．分析題干可知_______ I can't understand 是一個(gè)主語從句，句中缺少賓語，所以答案選what；he wants to change his mind是表語從句，句中不缺少句子成分，所以用that引導(dǎo)；故答案選B．

點(diǎn)評 名詞性從句一直是高考考查的熱點(diǎn)，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(xué)生對定語從句和名詞性從句有清晰的辨認(rèn)． 首先我們要判斷它是哪個(gè)名詞性從句．名詞性從句是主句的一部分，可以充當(dāng)主語、賓語、表語、同位語．就是說，如果我們能判斷出某個(gè)從句是某個(gè)主句的主語、賓語、表語或同位語，

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