_______we can go for a trip this weekend is still unknown.

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_______we can go for a trip this weekend is still unknown.
答案是Where,但为什么不能用whether呢?求详解!

原意为：这周末我们可以去哪旅行还不知道（还没打算）
is 前面的这个句子where .weekend充当主语,是主语从句,主语从句是一种名词性从句
where 在这里是表地点的疑问副词,根据意思,我们去哪里旅行,可以很快推出来
whether 一般是是否的意思,一般和or not 搭配,如果这里用whether,翻译为,这个周末我们是否可以去旅行还不知道,其实意思也可以例如：Whether we will go for an outing tomorrow remains unknown.这句话和你的基本一致
所以我感觉两个都可以 ,除非这句话出自于某完形填空,那么具体还要根据上下文来选择

___is still unknown when we can finish this project. —Will you go on a school trip this weekend?—We’ll go it does 1We will go on a field trip if it {rain]this weekend 2While 1.—Will you go on a school trip this weekend? is this his first time---（ go ）on a trip? go on a trip和go for a trip I won't go swimming this weekend.I'll go out for a picnic _______we goto the zoo on Sunday?-----This is a good idea we will have a trip to the farm this weekend. the reason why he was late for school is still unknown to us he hopes ______ go to beijing for a trip .A.he can B.him C.h we can go to a movie this weekend 改为一般疑问句