单选题 ______children have been taken out of school and taught by their parents at home.
【正确答案】 A
【答案解析】解析:a number of后面跟复数,同时谓语动词用复数形式;a great deal of和an amount of后面接不可数名词;the number of后面的谓语动词应该是单数形式。