一道英语选择题I have no idea _______ they have kept in touch with m

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一道英语选择题
I have no idea _______ they have kept in touch with me by writing letters since last year.
A.what B.how long C.why D.when
选什么?为什么其它几个不对?

根据本句的逻辑关系和语法空格里需要一个连接词.
What,how,当连接词时应该有双宾语如：Do you know what i said 所以what 不能选.
B,C,D 可以但是据句意 SINCE LAST YEAR 最符合的只有why

i have no idea _they have kept in touch with each other by w I have kept touch with sb. I have no idea _______ they will pass the final exam. A．that I have no idea he went abroad in 2006.______we have kept in touch with each 英语they no idea和They have no idea有什么区别? i have no idea what to do with him. 一道英语选择题02do you have any idea what pauldoes all day?__as i k 1.I have no idea--- I have no idea （） I'm sorry I have no idea.Please ask _____one. i have no idea what i'm saying 还是i have no idea what am i sa