It is pretty well understood __________controls the flow of carbon dioxide in an
题型:不详难度:来源:
It is pretty well understood __________controls the flow of carbon dioxide in and out the atmosphere today. |
答案
C |
解析
主要测试主语从句。分析句子结构可知:句子属于形式主语格式;另外主句中缺少主语。双重作用的引导词只能是what。例如:It is still doubtful what he said at the meeting yesterday。昨天他在会上说的话仍然值得怀疑。 |
举一反三
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