By yesterday, the plane out of view for more than a month.A．isB．has beenC．wasD．had been 题目和参考答案——青夏教育精英家教网—

题目内容

By yesterday, the plane ______out of view for more than a month.

A．is

B．has been

C．was

D．had been

解析试题分析：句意：到昨天，飞机已经失去联系了一个多月。根据By yesterday可知该用过去完成时，所以选D。
考点：考查动词时态。

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