Is oxygen the only gas helps fire burn? A. that B. / C. which D. it

发布时间：2020-08-17 12:19:32

Is oxygen the only gas      helps fire burn?
A. that
B. /
C. which
D. it

网友回答

(答案→)A. that
B. /
C. which
D. it
解析：先行词gas被only修饰，关系代词要用that，而不用which。
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