Unless ________ to speak, most high school students here prefer remaining silent in class. A.invited...
2022-07-02 20:40:03 33次 2016年1月内蒙古业水平考试英语试卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Unless ________ to speak, most high school students here prefer remaining silent in class.
A.invited B.inviting C.being invited D.having invited
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