I think their plan will work, but they themselves are very______about it.A、certa

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问题 I think their plan will work, but they themselves are very______about it.

选项 A、certain
B、suspicious
C、confident
D、doubtful

答案 D

解析 certain确定的；suspicious怀疑的，可疑的；confident有信心的；doubtful怀疑的，不确定的，be doubtful about／of sth.对…表示怀疑，不确定。译文：我认为他们的计划会可行，但他们自己却对此表示怀疑。

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