2.She moved to Hainan ten years ago.We____ each other since thenA.did"t seeB.haven"t seenC.wouldn"t seeD.hadn"t seen告诉这道题涉及到了什么语法

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2.She moved to Hainan ten years ago.We____ each other since thenA.did
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2.She moved to Hainan ten years ago.We____ each other since thenA.did"t seeB.haven"t seenC.wouldn"t seeD.hadn"t seen告诉这道题涉及到了什么语法
2.She moved to Hainan ten years ago.We____ each other since then
A.did"t see
B.haven"t seen
C.wouldn"t see
D.hadn"t seen
告诉这道题涉及到了什么语法

2.She moved to Hainan ten years ago.We____ each other since thenA.did"t seeB.haven"t seenC.wouldn"t seeD.hadn"t seen告诉这道题涉及到了什么语法
选择B,现在完成时态,表示从过去某一时刻持续到现在的持续状态.标志是“since”.

2.She moved to Hainan ten years ago.We haven't seen each other since then
这道题涉及到现在完成时和一般过去时

B.haven"t seen
现在完成事态,表示到现在已经完成,常与for+时间段。用在一起

B,第一句一般过去,第二句现在完成