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i felt quite _____ what i was supposed to do then.

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i felt quite _____ what i was supposed to do then.
A.unsure of B.uncertain about C.certain about
请问这题目为什么是选B 呢,解释下其他两项不能选的原因吧
i felt quite _____ what i was supposed to do then.
首先,语义是我不确信,所以C排除掉;
其次 A中 Be unsure of oneself或 be unsure onself表示不自信,后不接从句,所以,选B