有這樣一句話，In what could be a historic moment in the struggle against climate change, the Environmental Protection Agency on Friday confirmed what most people have long suspected but had never been declared as a matter of federal law: carbon dioxide and other greenhouse gases constitute a danger to public health and welfare.
這句話In what could be a historic moment in the struggle against climate change里what是作什么用的呢？擔任什么成分呢？
what could be a historic moment in the struggle against climate change 用作介詞 in 的賓語；In what could be a historic moment in the struggle against climate change 在句中用作狀語，表示時間。
In what could be a historic moment in the struggle against climate change 的大意是：在與氣候變化作斗爭過程中的這一歷史性時刻。
是的，這里 what 是用作主語——即 what 在此引導賓語從句（用作介詞 in 的賓語），且在賓語從句中用作主語。注意 what 不是關系代詞，而是連接代詞（也有的書稱之為“關系代詞型連接代詞”）。 正如龍楠老師所說，句中的what 相當于the time that 或 the process that，也就是說，what 雖然在此不是關系代詞，但它包括了“先行詞”和“關系代詞”。
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：2013/9/13 19:47:11
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