【題目】The students didn't understand the question until it (explain) again.

【答案】was explained
【解析】句意:學(xué)生們不理解這個(gè)問(wèn)題直到它再次被解釋了一次。It指的是the question,the question與explain之間是被動(dòng)關(guān)系,根據(jù)didn't understand用的是一般過(guò)去時(shí),所以這里應(yīng)該用一般過(guò)去時(shí)的被動(dòng)語(yǔ)態(tài)。所以答案是:was explained。

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