If you don't know ____________ a problem,don’t be sad.Just t

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If you don't know ____________ a problem,don’t be sad.Just think it over.
If you don't know ____________ a problem,don’t be
sad.Just think it over.
A.how to do with B.how to do C.what to do with D.what to do
请问：C与D有何区别?为何不选B?a problem可以作 how to do 里do的宾语啊 ,请详解.

do problem是不通的,所以需要连接词 with
如果选B,选项应该是 how to solve 如何解决.

If you don't know ____________ a problem,don’t be sad.Just t Don’t be sad My sad you don’t know是什么意思 Don't be such a sad apple. Don't be so sad.. Don t You Just Know It 歌词 If You Don T Know 歌词 If you don't know how___the right fork or knife,just watch t I don't know if you don't have facebook then you don't need Don't give up.Just be you 英语翻译If you don't know.please don't speak to me.Don't talk to 英语翻译Don't you cry Don't you look so sad We both know somehow