组卷网 > 高中英语综合库 > 单词辨析 > C > casual
题型:单项选择 难度:0.94 引用次数:121 题号:22863078
Scientists are ______ about the United States’ scheduled return to the Moon due to the delays in the development of the required spacesuits.
A.frankB.skepticalC.casualD.identical

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