one out of.

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one out of.
One out of every twenty students____dropped from the course each term.
A.is B.are
请问,这里为什么是A呢.

主语是"ONE OUT OF EVERY TWENTY SS" 每20个学生当中有一个,表示一个学生怎么怎么样,是单数

one out of ten four out of one out of one's one out of 帮个忙, go out of one’s "out of one\'s talent\" out of one's love 英译中one out of four out of one's hand Out of one hundred. 是什么意思? one out of fifteen of thesebottles是什么意思? only one of、one out of与only one out of的区别