I don't know________ You can go and ask Jack.A.when does the train leave b.THAT WE WILL PLANT TREES OR NOT c.IF SHE HAD COME YESTERDAYD.what i should buy for him

I don't know________ You can go and ask Jack.A.when does the train leave b.THAT WE WILL PLANT TREES OR NOT c.IF SHE HAD COME YESTERDAYD.what i should buy for him
I don't know________ You can go and ask Jack.
A.when does the train leave
b.THAT WE WILL PLANT TREES OR NOT
c.IF SHE HAD COME YESTERDAY
D.what i should buy for him

I don't know________ You can go and ask Jack.A.when does the train leave b.THAT WE WILL PLANT TREES OR NOT c.IF SHE HAD COME YESTERDAYD.what i should buy for him
答案：D
翻译：--我不知道我该给他买点什么.--你可以去问问杰克.
1.宾语从句的结构是：引导词 + 陈述句.
2.A不是陈述句,does the train leave是疑问句/倒装句序,排除；
B错在that引导的宾语从句不能出现or not,一般用whether“是否”和or not连用,排除；
C错在时态,yesterday表明该从句不能使用过去完成时,而必须使用一般过去时或过去进行时.
3.答案D不管是结构还是时态,都符合题目要求.

选B。。这是一个konw引导的宾语从句，后面应该用陈述语序，所以A排除，根据题意D不可选择。C。had后应该跟过去分词则是came。所以是错的