题目内容：

my father knows a lot about American culture ,for he ___ there for 2 years ,and then he returned home.
A.stays
B .stayed
C.would stay
D.have stayed

优质解答

选项：B
解析：因为题目交代了父亲已经回家了,所以此时已经不再美国了,故可排除A和D.C是将要,也不符合题意.选B.