题目内容
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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