单选题：He is doubtful about the decision she had made.

题目内容：

He is doubtful about the decision she had made. A．sure
B．angry
C．uncertain
D．worried

参考答案：【答案仅供学习，请勿对照自行用药等】

答案解析：

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This kind of material was occasionally used in making shoes.A．never B．rarely C．o

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