The director wants to make sure no one will solve the mystery until it ________ at the end of the horror film.

A．is explained B．will be explained C．explains　 D．has explained

A

解析試題分析：句意：導演想確保在這部恐怖片的末尾揭示真相之前沒有人能夠破解這個謎團。Until引導的時間狀語從句用一般現(xiàn)在時來表達將來時，it和explain存在著邏輯上的動賓關系；所以用被動結構；故選A。
考點：考查時態(tài)和語態(tài)。

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