what was it ( )made them so busy ( ) they had zero time for

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what was it ( )made them so busy ( ) they had zero time for outdoor sports a
A.which,that B.that ,that C.that,which D.which,which
我主要是不懂第一个空为什么要用that,怎么不能使用which,也就是说我的疑问是为什么它一定是个强调句,而不是定语从句

相信你已经知道强调句的用法了吧,我就不多说了.而从内容上说which引导的非限制性定语从句,which在句中会充当一定的成分,what was it本身就不是一个确定的事物,用which指代同样的不能使句意明确.而且语法上which指代句子时,which一般用“,”与前面的隔开.
再问：你这么说有一点问题，which不仅仅可以引导非限制性定语从句，它还可以引导限制性定语从句
再答：限制性定语从句是先行词不可缺少的部分，去掉它主句意思往往不明确；非限制性定语从句是先行词的附加说明，去掉了也不会影响主句的意思，它与主句之间通常用逗号分开。在这里你如果理解为限制性定语从句，暂时去掉后，读一下，句意已经不明确了。所以不是限制性定语从句的相关内容。

what was it ( )made them so busy ( ) they had zero time for The engineers are so busy that they have zero time for outdo 求翻译!But what directly made them excited was that they had th [周报1期T14] The engineers are so busy that they have zero time （it was） really stupid （of） them for show everyone what they it was what that made you so beautiful Was it what he said ___ made her so sad? now it was time for them to go home it was time for them( )home A.go B.to It was impossible for lost time to be made up What made them so worried?改被动语态,How soon will they finish th 看到一个句子 ‘They had made so wonderful a plan that the work was