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Three fourths of the homework _________ today.
A．has doneB．has been doneC．have doneD．have been done
B
homework 是不可數名詞，它的四分之三也是不可數名詞，所以排除C，D;且homework 和do是動賓關系，所以要用被動語態(tài)。所以選B。
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