Mr dong ____ to the factory.He will be back __an hour .A .has gone,after B has been ,in C.has gone,i

题目

Mr dong ____ to the factory.He will be back __an hour .A .has gone,after B has been ,in C.has gone,in D has been ,after

答案

A gone和been的区别是,gone是还没回来,been是去过已经回来.
in an hour是一个小时以后的固定用法