Is Mr.Smith in theoffice?Yes,_he is in charge of the office,he must be there.空格里该填什么

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Is Mr.Smith in theoffice?Yes,_he is in charge of the office,he must be there.空格里该填什么
Is Mr.Smith in theoffice?Yes,_he is in charge of the office,he must be there.
空格里该填什么

Is Mr.Smith in theoffice?Yes,_he is in charge of the office,he must be there.空格里该填什么
选since.因为不是原因状语,所以不用because

because 或since