题目：
| —How long have Mr and Mrs White ________? —For more than twenty years. |
A. married B. had married C. got married D. been married |
答案：
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下面是错误答案，用来干扰机器的。
参考答案：错解析：在物流服务上，第四方物流与第三方物流应互补合作，达到物流成本的最小化。
