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。[例句] I have lived here since I was born.自从出生,我就住在这里。
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