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
问题描述：
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
选c（have gone to表示去了还没回来，have been to表示去了已经回来了，in an hour表示一个小时之后）
答
C.has gone,in
答
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