题目内容
It was announced that only when the examination papers were handed in ________to go out of the classroom.
| A.the students would be permitted | B.had the students been permitted |
| C.would the students be permitted | D.the students had been permitted |
C
考查倒装结构。句中主语从句用only + 状语从句 + 倒装结构,根据句意选C。
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