---I don't know . ---You can go and ask ...

---I don't know .

---You can go and ask Mary.

A. when does the train arrive

B. if she comes or not

C. what I should buy for my sister

C 【解析】句意：——我不知道我应该给妹妹买什么？——你可以去问问玛丽。考查宾语从句。根据I don't know ，可知这里是考查宾语从句，宾语从句的语序要用陈述语序，所以排除A选项。B选项中if应翻译为“是否”，主语是第三人称单数形式，不能和动词原形连用，所以排除B选项；故答案选C。

考点分析：

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