Tim is in Australia.How long _____ there?

题目

Tim is in Australia.How long _____ there?
(a)is he (b)has he been (c)has he (d)was he
这个是选b吧,想问下,选a行么?ab两个意思有什么区别?

答案

选B,反过来说：
tim(he) has been australia XXX years.
是正确的,他呆在澳洲XXX年了.过去完成时.
你把这题反过来看,换成：
Tim(he)_______australia XXX years.你觉得添什么好呢?