你好,同学,才看到你向我们 王牌英语团 发来的求助题,现在为你解答
答案：A是正确的
原因：因为A的表达方式是正确的,three and a half years 三年半的意思,还可以表达为three years and a half,也是三年半的意思,而B的表达方式是错误的.
另外 a half year = half a year 都是半年的意思
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She has been skating for _____.A.three and a half years B.th
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