一道英语选择题十二11Our teacher didn’t know how log the Greens _____ China .A.have come to B.had been in C.had gone to D.had been to请说明理由

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一道英语选择题十二11Our teacher didn’t know how log the Greens _____ China .A.have come to B.had been in C.had gone to D.had been to请说明理由

一道英语选择题十二11Our teacher didn’t know how log the Greens _____ China .A.have come to B.had been in C.had gone to D.had been to请说明理由
一道英语选择题十二11
Our teacher didn’t know how log the Greens _____ China .
A.have come to B.had been in C.had gone to D.had been to
请说明理由

一道英语选择题十二11Our teacher didn’t know how log the Greens _____ China .A.have come to B.had been in C.had gone to D.had been to请说明理由
选B
我们的老师不知道格林一家在中国呆了多长时间了.
A不能去完成时,可以说...came to China ...ago.
C是指去了还没有回国,D是曾经去过,只有B才能表示状态,即停留时间的长短