We have to delay the party till next week, we will not have something important to do. A

发布时间：2020-08-17 13:14:08

We have to delay the party till next week,      we will not have something important to do.
A. when         B. which              C. at which         D  that

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解析：表示时间的副词when引非限制性定语从句。
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