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At present ________ of the experiments ________done in labs after the new building has been finished.

A.four fifth; is B.four fifths; are

C.four fifth; are D.four fifths; is

 

B

【解析】答案 B [考查分数的表达方法。of后面的名词是可数名词复数,因此谓语动词要用复数。]

 

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