Roy walked out of the exam room at four o'clock he/(take)/maths exam 用already或just
问题描述：
Roy walked out of the exam room at four o'clock he/(take)/maths exam 用already或just
he/(take)/maths exam在里面加入already或just
答
Roy walked out of the exam room at four o'clock he had already taken (take)/maths exam .为什么因为他“已经”考完了，所以他走出来。