问题
选择题
Is oxygen the only gas _______ helps fire burn?
A．that
B．/
C．which
D．it
答案
答案：A
先行词gas被only修饰，关系代词要用that，而不用which。
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Is oxygen the only gas _______ helps fire burn?
A．that
B．/
C．which
D．it
答案：A
先行词gas被only修饰，关系代词要用that，而不用which。