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，飛機已經(jīng)失去聯(lián)系了一個多月。根據(jù)By yesterday可知該用過去完成時，所以選D。
考點：考查動詞時態(tài)。

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