问题
选择题
Twofifths of the highway________so far.
A．has been completed
B．was completed
C．have been completed
D．has completed
答案
答案：A
答案 A [of 后面的名词是单数，所以谓语动词需用单数，由so far得出要用现在完成时，故选A。]
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Twofifths of the highway________so far.
A．has been completed
B．was completed
C．have been completed
D．has completed
答案：A
答案 A [of 后面的名词是单数，所以谓语动词需用单数，由so far得出要用现在完成时，故选A。]