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?jǐn)?shù)的表達(dá)方法。of后面的名詞是可數(shù)名詞復(fù)數(shù)，因此謂語(yǔ)動(dòng)詞要用復(fù)數(shù)。]

 

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