问题描述：
求助一个语法知识的讲解
My uncle ___ in Taiwan for 20 years. Now he has settled down in mainland.
A.lived B.had lived C.has lived D. was living
答案是A.哪位高手能清楚的解释一下为什么不能用D
My uncle ___ in Taiwan for 20 years. Now he has settled down in mainland.
A.lived B.had lived C.has lived D. was living
答案是A.哪位高手能清楚的解释一下为什么不能用D
问题解答：
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