Mary and John_______ each other since childhood. ( )

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问题 Mary and John_______ each other since childhood. (    )

选项 A、have been knowing
B、knew
C、have known
D、had known

答案C

解析 since childhood意为“从童年时期开始”,可知本题应使用完成体。由于没有明显的过去时间标志词出现,因此可选用现在完成体。答案为C。
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