Two­fifths of the highway________so far.
A．has been completedB．was completed
C．have been completedD．has completed
A
答案　A　[of 后面的名詞是單數(shù)，所以謂語動詞需用單數(shù)，由so far得出要用現(xiàn)在完成時，故選A。]
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