In ten years' time ,all those youngsters will becme---.

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In ten years' time ,all those youngsters will becme---.
A grown-up
B grown-ups
c growns-up
D growns-ups
我选C为什么错了不是说名词+介词或介词短语构成的复合名词变复数时,将主体名词（或中心词）变复数

复合名词的复数：
(a) 分开写的复合名词：跟男女无关的,最后一个变复数.如 apple tree→apple trees.
跟男女有关的,两个都变复数.如 man teacher→men teachers
(b) 用连词符连接的复合名词：
1有主体名词的,主体名词变复数.如 brother-in-law (姐夫) →brothers-in-law.
2【没有主体名词的,最后一个词变复数】.如 grow-up (成年人) →grow-ups.
再问：【没有主体名词的，最后一个词变复数】。如 grow-up (成年人) →grow-ups. There are many----on the scene of the accident. A lookers-on B lookers--ons C looker-ons D looker-on 这题答案为什么是A 不是说【没有主体名词的，最后一个词变复数】。如 grow-up (成年人) →grow-ups. 以上两题怎么区别
再答： looker-on “旁观者”，它有主体名词，即looker，“看客”，所以，复数是lookers-on

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