问题详情：
Two fifths of the highway________so far.
A．has been completed B．was completed
C．have been completed D．has completed
【回答】
分数在此指代的是the highway，与complete之间在逻辑上是被动关系，由so far可知用现在完成时。
*： A
知识点：动词时态
题型：选择题
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