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(dǎo)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(gè)謎團(tuán)。Until引導(dǎo)的時(shí)間狀語從句用一般現(xiàn)在時(shí)來表達(dá)將來時(shí)，it和explain存在著邏輯上的動(dòng)賓關(guān)系；所以用被動(dòng)結(jié)構(gòu)；故選A。
考點(diǎn)：考查時(shí)態(tài)和語態(tài)。

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