___ the beginning of the meeting, the president made a speech ___ how to reduce pollution. A．at; in ...
2023-02-24 11:04:29 198次 全国通用英语介词专项训练 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
___ the beginning of the meeting, the
president made a speech ___ how to reduce pollution.
|
A．at; in
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B．at; on
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C．in; on
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D．on; on
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本题链接：
