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题目
题型:不详难度:来源:
Is oxygen the only gas _______ helps fire burn?
A.that B./ C.which D.it

答案
A
解析
先行词gas被only修饰,关系代词要用that,而不用which。
核心考点
试题【Is oxygen the only gas _______ helps fire burn? A.that B./ C.which D.it】;主要考察你对句式等知识点的理解。[详细]
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