這道題不但考察了現(xiàn)在完成時（for two years、two years ago是現(xiàn)在完成時的標(biāo)志）,還考察了“入團”這個短語的多種形式.
其實我認為這道題以后者考察為主.
畢竟現(xiàn)在完成時就是has/have done的形式,而短語“入團”有join the party或 joined the League、be a League member、be a member of the League……
所以,該填空可以是：
I have been a League member for two years.
I have been a member of the League for two years.
I joined the League two years ago.
I have joined the League for two years.