I have no idea ____they have kept in touch with each other b

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I have no idea ____they have kept in touch with each other by writing letter.
A what B how long C why D when
答案选B
选C 可以吗翻译成：我不知道为什么她们一直通过写信彼此联系.
谢谢，我想知道 C选项不选的原因。

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 by w I have kept touch with sb. he went abroad in 2006.______we have kept in touch with each I have no idea i have no time()(chat)with each other.按正确形式填空. He thinks the two cases have no connection with each other,b We all have fall in love with each other. i have no idea what to do with him. 1.I have no idea--- I have no idea （） ( )I have no doubt in my mind ____they will be glad to see m I hope we'll stay in touch with each other.这句话怎么改反意疑问句?