:
Mike hasn’t come for a year.（√）
过去完成时
表示截止到过去某一时刻或在过去的动作之前（过去的过去）已经做或尚未做的动作。
By (=up to )last weekend we hadn’t got any information.
When he appeared, we had waited for 30 minutes.
现在完成时考点
考点一：考查基本概念
例 Both his parents look sad . Maybe they ______what's happened to him .（呼和浩特）Ａ. knew Ｂ. have known Ｃ. must know Ｄ.will know
简析：现在完成时主要强调过去发生的动作对现在造成的影响，或过去发生的动作还未结束，一直持续到现在或将来，重点在于对现在的影响。这种考查难度较大，往往无时间状语，需要从上下文分析、推理才行。故上两侧根据上下文分析、推理，正确答案是Ｂ。
考点二：考查时间状语
例1. He has _______ been to Shanghai , has he ?
