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问题: 一道英语选择题

Where was Alice's sister? I don't know where _____.
a.was Alice's sister b.Alice's sister was
c.is Alice's sister d.Alice's sister is
I think the right answer is "d",but the correct answer is "b",why? Please tell me the details of the question.

解答:

I don't know 后是回答前面的问句: where were Alice's sister?所以答案是: where Alice's sister WAS.另外: 当主句的谓语动词是一般现在时,宾语从句的时态不受其限制.