1、There is no simple answer,______ is often the case in science.2、By 16:30,______ was almost closing time,nearly all the paintings had been sold.为什么第一题不能填which?为什么第二题不能填as?

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1、Thereisnosimpleanswer,______isoftenthecaseinscience.2、By16:30,______wasalmostclosingtime,nearlyall

1、There is no simple answer,______ is often the case in science.2、By 16:30,______ was almost closing time,nearly all the paintings had been sold.为什么第一题不能填which?为什么第二题不能填as?
1、There is no simple answer,______ is often the case in science.
2、By 16:30,______ was almost closing time,nearly all the paintings had been sold.
为什么第一题不能填which?为什么第二题不能填as?

1、There is no simple answer,______ is often the case in science.2、By 16:30,______ was almost closing time,nearly all the paintings had been sold.为什么第一题不能填which?为什么第二题不能填as?
as
which
如果有“正如.那样” 用as,否则,用which 引导非限制性定语从句
 
 
 
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第一句用which的话,which指代的是answer,与实际不符
第二句逗号中间是插入语,需要是一个完整的句子,用as的话,句子不完整