Now Jimmy has sixteen bikes--- (fix) up.have的使役用法可

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要根据你想表达的时态来定；表将来 有16辆自行车要修 用 has sixteen bikes to fix up.
表已经修好用 has sixteen bikes fixed up
======以下答案可供参考======
供参考答案1:
have sb do，have sth done。所以have sixteen bikes fixed。