二、
1、Has been
2、hasn't gone yet
3、How long stay
4、How long has taught
5、for two years
6、has stayed
7、joined ago
8、didn't any more
9、neither have
三、
1、Have helped
2、have read
3、hasn't been home
4、has seen graduated from
5、have kept for
6、take as
7、really try to
8、more to live
Has been
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