three quarters of the staff作主语,谓语动词用单数还是复数啊?

three-quarters of an three-quarters of abillion是多少? for three quarters of an three-quarters of an three-quarters 是说中长吧~ three quarters of one precent是多少? three quarters of用什么提问 Three quarters of rue USA___with forest. three quarters of a century是什么意思 three quarters of all Americans是什么意思? three quarters of the students能否说成three quarters students three-quarters of the time怎么翻译啊? Three quarters of the earth___(be) covered with water. 9.Three quarters of the earth _________ water.(discover) three quarters of the earth is water为什么用is three quarters of the earth is water 为什么用is The students will have it finished in_.A.three quarters of an hour timeB.three quarters of an hour's Almost ______ of the earth ______ water.A.three quarters …are B.three quarters,is A or three quarters同义词