fall ill 和be ill 的区别 Mary _ill since she left her hometown last winter.

题目

fall ill 和be ill 的区别 Mary _ill since she left her hometown last winter.
承上面 选项为 A.fell B.has fallen C.was D.has been
选什么,为什么

答案

D
fall ill 是瞬间性动词,不可以延续,所以不能和since 短语连用.
be ill 是延续性状态,所以可以跟since短语.