问题标题：
时态的问题
问题描述：
-Has Linda come back from Canada
-Yes.She there for eight years
A.has stayed B.stays C.stayed D.had stayed
老师，答案为什么是B，怎么会用现在时？
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-Has Linda come back from Canada
-Yes.She there for eight years
A.has stayed B.stays C.stayed D.had stayed
老师，答案为什么是B，怎么会用现在时？
