I don't know ——— I should bring a present.A.whom B.if C.what

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你好.答案是B
IF == whether 是否------宾语从句的连接词.

Should I bring a present? I don't know that
主句与从句部分的合并-------就成了：I don't know whether / if I should bring a present.
从句部分：whether / if + 主语+ 谓语（+ 其他成分）
再问： whom 为什么不对
再答： nihao. 如果是whom,句子必须是： I don't know WHOM I should bring a present TO. (也就是说，原句少了一个to,在句子的末尾。)
再问：为甚麽不是 bring sb. sth. 直接将sb提前其余不变
再答：你好。尽管 bring sth to sb ==bring sb sth，但在宾语从句中，尤其是比较严谨的英语中，人们往往首选bring sth to sb 这个结构，否则你的句子裏面的if 和whom 都是正确的选项了。我相信出题人也是从这方面出发列出 if 和 whom 供你选择，否则他就出题不严谨了。
再问：你好可不可以解释一下双宾语直接宾语问题及其与定语从句关系
再答：好，没有问题。找个方便的时间吧。

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