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用if only或only if完成句子. a teacher has given permission is a student allowed to ent

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用if only或only if完成句子. a teacher has given permission is a student allowed to ent

用if only或only if完成句子。

________ a teacher has given permission is a student allowed to enter the room．

试题答案

答案：Only if

标签：句子haspermissiongivenif

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