2. 外语
  3. Since returning home with 32 gold medals, China’s Olympic champions______ (be) quite busy attending social events.

Since returning home with 32 gold medals, China’s Olympic champions______ (be) quite busy attending social events.

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问题 Since returning home with 32 gold medals, China’s Olympic champions______ (be) quite busy attending social events.
选项
答案have been
解析 现在完成时。此句中有一个since引导的时间状语，说明动作起始时间，用现在完成时，表示持续到现在的动作或状态。
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