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老师请回答一下原句是After gazing at the display for several minutes,Mr

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老师请回答一下原句是After gazing at the display for several minutes,Mr.Taylor went back into his
shop.
He ( )the display for several minutes before re entered his shop.A.was gazing at B.gazed at C.had gazed at D.had been gazing at 本人觉的应该选c 或 d ,但是答案是b 为什么呢?新概念三 课后原题
a 当 "每一"的时候的用法,前面有介词吗
1 我告诉你,最好的答案是C. 这本书的练习是由一些中国老师编的,但是质量不高.我可以找到他们的许多错误.

2 没有介词
He comes here once A week / twice A year.

it happens once in a while -----(这个,你要记住.)
再问： 请问，用a 表示 一次或 每次 怎么说， 上面的那个新概念题a 和 d 不好吗
再答： 1 绝对不能用“进行时” 2 you mustn't do two things at A time ------做事要一心一意，不能三心二意
再问： 再请教一下，为什么不能用进行时呢， a time 不能表示一次吗，one time 可以吗，不用介词
再答： 1 at one time ------解释为“曾经有段时间” 2 a time 不能表示一次吗，one time 可以吗--------可以理解，但是习惯用法应该得到尊重。 3 为什么不能用进行时呢，--------“进行时”表达的是“正在，还在”，与 went back into his shop 相矛盾。 went into 了他的shop, 他就不可能再gaze at什麼了，你说对吗？
再问： 他是先gaze 然后 went back into shop ，好象没有矛盾，老师
再答： ok, 他是先gaze 然后 went back into shop== he had gazed BEFORE he went==he went AFTER he had gazed
老师请回答一下原句是After gazing at the display for several minutes,Mr After gazing at the display for several minutes,Mr Taylor we 动名词用法~he gazed at the display for several minutes before re- he__ the display for several minutes before re-entering his 选择题：He__the display for several minutes before re-entering h He ________the display for several minutes before re-enterin The meeting ______just for several minutes.A.has begunB.has 请放学后跟王老师说一下 please【 填空 】【 填空 】Mr.Wang after school 请老师回答一下 He left the field after several minutes and made his side on he___the display for several mimutes before re-entering his Finally,stay inside at least 30 minutes after the____of the