He was so engaged ______ his business that he hadn’t been home for a month.A、at

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问题 He was so engaged ______ his business that he hadn’t been home for a month.

选项 A、at
B、on
C、for
D、in

答案 D

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[originaltext]W:Wouldyouliketoopenyourownbusiness?M:Iwouldn’tminda