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 |
D
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。

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题目内容
A.is | B.has been | C.was | D.had been |