As 409 students filed out of their exam, they found all but one exit blocked.Proctors asked each student to produce an ID card with an attached photo.是什么意思_As 409 students filed out of their exam, they found all but one exit blocked.Proctors asked each student to produce an ID card with an attached photo.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句