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

A．isB．has beenC．wasD．had been

D

解析試題分析：句意：到昨天，飛機(jī)已經(jīng)失去聯(lián)系了一個(gè)多月。根據(jù)By yesterday可知該用過(guò)去完成時(shí)，所以選D。
考點(diǎn)：考查動(dòng)詞時(shí)態(tài)。

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