I parked my car right here but now it's gone.It

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A must have been stolen 一定是被偷走了
======以下答案可供参考======
供参考答案1:
答案选A must have been stolen
根据句意，这里表示肯定的猜，表示“ 一定是被偷走了”。所以答案选 A must have been stolen
供参考答案2:
A must have been stolen
肯定的，B和D的语态不对