the population is large and about four fifths of it are farmers

the population is large and about four fifths of it are farmers

题目
the population is large and about four fifths of it are farmers
答案
population 做主语时,谓语一般用单数,如:
the population 【is】 large
但如果population 和分数,百分数连用,做主语,表语是复数时,此时谓语一般用复数,如:
about four fifths of it(=the population) 【are】 farmers(复数名词作表语)
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