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(yǔ)從句。本題的it是形式主語(yǔ),真正的主語(yǔ)是what the effects of global warming will be. what在句中做表語(yǔ)。句意:全球變暖的影響是什么現(xiàn)在還不清楚。故D正確。
點(diǎn)評(píng):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(yǔ),賓語(yǔ),表語(yǔ)和定語(yǔ);連接副詞when, why, where, how,在句中做狀語(yǔ)。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(lái)說(shuō),考生在解答此類(lèi)型時(shí),可用排除法或造句法,造句法就是仿造原句的語(yǔ)法功能仿造出一個(gè)易懂易理解的句子,幫助判斷。
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