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初中英语All the old things were invented ______ ago. A. hundreds

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初中英语
All the old things were invented ______ ago.
A. hundreds of year B. hundreds of years
C. a hundreds of years D. a hundred of years
这道题答案是B
我选的D,请懂的朋友帮忙讲一下吧``谢谢
初中英语All the old things were invented ______ ago. A. hundreds
这里考查的是对数词用法的掌握.
对于hundred与thousand这类词.
如果前面有数词修饰,他们不能用复数形式和接of.
e.g.three thousand
如果用复数形式,通常为:
thousands of/ hundreds of