all_____is needed is fresh airA the thing B that C what D wichA the thing B thatC what D wich

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all_____is needed is fresh airA the thing B that C what D wichA the thing B thatC what D wich

all_____is needed is fresh airA the thing B that C what D wichA the thing B thatC what D wich
all_____is needed is fresh airA the thing B that C what D wich
A the thing B that
C what D wich

all_____is needed is fresh airA the thing B that C what D wichA the thing B thatC what D wich
B all 充当先行词,因为是不定代词,所以关系词用that来引导定语从句.
all that = what

A

all that=what
选B

B

选that啊,定语从句,
A 不对因为从句中all应作主语,所以必须有关系代词
C 不对因为what不能引导定语从句
D不对因为定语从句中which不能代 all

d