老师请回答一下原句是After gazing at the display for several minutes,Mr.Taylor went back into hisshop.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

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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.)

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