I'm not sure who is more frightened 是什么从句

I’m not sure ___61___ is more frightened, me or the female gorilla (大猩猩) that suddenly appears out of nowhere.

这是2018全国卷3的语法填空中的句子。答案填 who。

请问 who is more frightened 是什么从句？有人说是宾语从句，不太懂，这有依据吗？

是的，句中的 who is more frightened 分析为宾语从句是对的，而且是有依据的。

I'm not sure who is more frightened.

= I don't know for sure who is more frightened.

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