【题目】It was announced that only after the candidates’ papers were collected _____to leave the room.
A. had they been permitted B. would they be permitted
C. that they would be permitted D. that they had been permitted
在线课程【答案】B
【解析】
考查倒装和时态。句意：宣布说只有在竞选者的论文都收集完毕，他们才被允许离开。从句Only after 后用倒装，排除CD，又表将来时态，故选B。