问题
选择题
By yesterday, the plane ______out of view for more than a month.
A．is
B．has been
C．was
D．had been
答案
答案：D
题目分析：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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By yesterday, the plane ______out of view for more than a month.
A．is
B．has been
C．was
D．had been
答案：D
题目分析：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。