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A greenhouse is a building of glass for keeping plants warm when the outside tem

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A greenhouse is a building of glass for keeping plants warm when the outside tem

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

试题答案

A

解析