题目

—Has your son come back from abroad for the winter vacation? —Yes.But he stayed at home for only a week.Now he       back to college. A.went                         B.has gone             C.was going          D.will go 答案：B根据4.68÷1.2＝3.9可知，12×39＝_____，46.8÷_____＝3.9．