david is the person (whom or who) i have been know for a long time.I met him at the first day i just came to Canada.He (is or was) a hospitable person.
人气：118 ℃ 时间：2020-08-30 02:42:21
解答
david is the person (who) i have （去掉been）( known） for a long time.I met him (at 改为on）the first day i just came to Canada.He (is ) a hospitable person.
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