问题描述: When __ he __(receive) this letter? 1个回答 分类:数学 2014-11-03 问题解答: 我来补答 最适合的有两种填法:When (will) he (receive) this letter?When (did) he (receive) this letter?请指出,希望能和你一起探讨~如果认为我的回答好的话,请及时采纳, 展开全文阅读