---May I use your cup, Tom?---Sorry, it ________ by my sister just now. A.was broken  ...

---May I use your cup, Tom?---Sorry, it ________ by my sister just now. A.was broken B.is broken C.broke

A

被动语态的用法。根据句意可知是被动语态,又时间状语为just now,故答案为A。
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