9．______ a new house is impossible for the young couple because they haven't saved enough money．（　�。�
A．BuyB．BuyingC．BoughtD．Having bought

分析 對年輕的夫婦來說買一個新房子是不可能的，因為他們沒有攢夠足夠的錢．

解答 答案B分析句子成分可知，這里的is impossible是系表結(jié)構(gòu)作謂語，前面的部分是主語．A選項動詞原形不能作主語；B選項動名詞可以作主語；C選項過去式或過去分詞不能作主語；D選項現(xiàn)在分詞的完成式也不能作主語．因為能作主語的非謂語形式是動名詞和不定式，故選B．

點評 本題考查動名詞作主語，解答本題的關(guān)鍵是正確分析句子成分和結(jié)構(gòu)，明確能作主語的非謂語形式是動名詞和不定式．

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