My brother joined the League _____ March 24,1990.He

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My brother joined the League _________ March 24,1990.He _____a League member for six years
on,has become .on,has been in,has been in,has become

on,has been.
表示具体的某一天,前面介词要用on,表示年,月,四季,世纪,前面用in；
后面有for表示一段时间,要用完成时,且要用表示状态或持续性的动词.所以不能用has become.

My brother joined the League _________ March 24,1990.He ____ Li Ping joined ____ League in 2002.He has been ____ League m He said that he had joined the League in 1985. He joined the League in 2004.变同义句 Elias trusted Mandela and he joined the ANC Youth League. his brother joined the league two years ago.同义句 his brother he joined the league in 2002改写he()()a()()the()for two years I will never forget the day ____ I joined the League. he joined the league in 2002改写he()()a()()for two years He said he ______ the league for two years.A.has joined B.ha I'll never forget the days when I joined the League.He still He told me the date___he joined the League,___he would never