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Aftersilence,theybegantowriteletterstoeachother.[]A.threeyears'B.three-yearsC.three-yearD.athree-year为什么不选择A?

题目详情
After ________ silence,they began to write letters to each other.
[ ]
A.three years' B.three-years
C.three-year D.a three-year
为什么不选择A?
▼优质解答
答案和解析
A C完全相同,B错误.只有D对.
作定语 就要加a.