C也是对的,语法上没有错误,但深究的话,出题点应该是考完成时表示一段时间发生的事,选B就是为了说明完成时态与how long的关系,有些试题就是这样的,不只一个答案正确,但一般以参考答案为准,这种题正式考试时不会出的,
I have no idea ____they have kept in touch with each other b
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