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It is not clear ____the effects of global warming will be.
A．howB．whichC．thatD．what
D

試題分析：考查名詞性從句的主語從句。本題的it是形式主語，真正的主語是what the effects of global warming will be. what在句中做表語。句意：全球變暖的影響是什么現(xiàn)在還不清楚。故D正確。
點評：名詞性從句的考查集中在引導(dǎo)詞的選擇上，連接詞that, whether, if在句中不充當(dāng)任何成分，只起連接作用；連接代詞who(ever), which(ever), whom(ever),whose(ever),what(ever)在句中做主語，賓語，表語和定語；連接副詞when, why, where, how，在句中做狀語。應(yīng)從上下句的句法關(guān)系著手分析，切不可‘望句形生答案’總的來說，考生在解答此類型時，可用排除法或造句法，造句法就是仿造原句的語法功能仿造出一個易懂易理解的句子，幫助判斷。
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