问题描述：
----How long_______ in Australia?
----Eighteen months.I came back last Spring.
A.have you studied B.have you studied C.did you study D.do you study
给的答案是c 说是这是情景交际题，提问者应用一般过去时提问
----Eighteen months.I came back last Spring.
A.have you studied B.have you studied C.did you study D.do you study
给的答案是c 说是这是情景交际题，提问者应用一般过去时提问
问题解答：
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