题目内容

A greenhouse is a building _______ of glass _______ for keeping plants warm when the outside temperature is low..
A.made, which is usedB.which is made, is used
C.made, being usedD.is made, used
A
第一空考查非谓语动词,用过去分词作定语修饰a building,第二空是定语从句,which 在从句中做主语,短语:be used for 被用来做某事,所以选A。
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