The lecture begins at 9 tomorrow morning .So I have to be at the hall 8:40 pm. at the late

发布时间：2020-08-15 00:50:36

The lecture begins at 9 tomorrow morning .So I have to be at the hall     8:40 pm. at the latest.
A until   B after    C by    D around

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解析：by 后面加时间表示：到这时间为止。
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