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Nanking Yangtse River Bridge is about______wide.A.fifteen me

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Nanking Yangtse River Bridge is about______wide.A.fifteen metre B.fifteen metres C.fifteen-
meters D.fifteen-metre
答案选B
应该是 fifteen meters wide 或 a fifteen-meter-wide bridge
也就是说,如果用连字符,中间都是单数,后面应该还有所修饰的事物的名词.如果不用连字符,那中间的修饰词应该用复数.
如:a fifteen-year-old boy
The boy is fifteen years old
这两种表达.