They are also worried _________ all the students are able to make good use of the spare time after ...
2023-01-28 00:19:42 154次 2010年广东省山一高一上学期第一次段考英语卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
They are also worried _________ all
the students are able to make good use of the spare time after school.
|
A．about
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B．whether
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C．that
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D．what
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本题链接：
