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
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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