Maybe she'll come,but I'm not quite c( ) about that.

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Maybe she'll come,but I'm not quite c( ) about that.
Maybe she'll come,but I'm not quite c( ) about that.

Maybe she'll come,but I'm not quite c( ) about that.
certain
形容词 a.1.确凿的,无疑的;可靠的
2.确信的,有把握的;一定会的[F][(+of/about)][+(that)][+wh-][+to-v]

certain
希望能帮到你。
我等着你采纳哟,不明还可以追问的,嘻嘻!

certain

concerned