By yesterday, the plane ______out of view for more than a month.A．isB．has beenC．
题型：不详难度：来源：
By yesterday, the plane ______out of view for more than a month.| A．is | B．has been | C．was | D．had been |
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答案
| D |
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。 |
举一反三
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