At present  ________ of the experiments  ________done in labs after the new building has been finished.
A．four fifth; isB．four fifths; are
C．four fifth; areD．four fifths; is
B
答案　B　[考查分數(shù)的表達方法。of后面的名詞是可數(shù)名詞復數(shù)，因此謂語動詞要用復數(shù)。]
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