It is pretty well understood _______ controls the flow of carbon dioxide in and out the atmosphere today.

A. that　　　　　　　　　　 B. when

C. what　　　　　　　　　　 D. how

 

C

句首的 it 是形式主語(yǔ)，空格處所填詞用于引導(dǎo)主語(yǔ)從句。由于該主語(yǔ)從句中又缺主語(yǔ)，故排除A、B、D。（注意：不能選 A，因?yàn)?that 引導(dǎo)名詞性從句時(shí)不能充當(dāng)句子成分）

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