题目内容
8．By yesterday，the plane ______out of view for more than a month．（ ）| A． | is | B． | has been | C． | was | D． | had been |
分析 到昨天，飞机已经失踪一个多月了．
解答 答案：D 根据句意"到昨天，飞机已经失踪一个多月了"，表示在昨天前已经完成了"失去联系一个多月"这个动作，过去某一时间或动作之前已经发生或完成了的动作，选择过去完成时，它表示动作所发生的时间是"过去的过去"，常用"助动词had+动词过去分词"构成．A一般现在时，B现在完成时，C一般过去时，所以选D．
点评 本题主要考查过去完成时，表示在过去某一时间或动作之前已经发生或完成了的动作．它表示动作所发生的时间是"过去的过去"，常用"助动词had+动词过去分词"构成．
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