Is Mr.Smith in theoffice?Yes,_he is in charge of the office,he must be there.为什么填since而不是for?

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Is Mr.Smith in theoffice?Yes,_he is in charge of the office,he must be there.为什么填since而不是for?
Is Mr.Smith in theoffice?Yes,_he is in charge of the office,he must be there.
为什么填since而不是for?

Is Mr.Smith in theoffice?Yes,_he is in charge of the office,he must be there.为什么填since而不是for?
Since作为"因为由于"解释时引导的原因状语是句子,且可以位于句首;而for作为"因为由于"解释时引导的原因状语不能是句子,只能是短语.此处原因状语为句子,故答案为Since