____the lecture began.A.After we took our seats B.After we have sat down C.Having been seated D.Having sat down解释下为啥选A b
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![____the lecture began.A.After we took our seats B.After we have sat down C.Having been seated D.Having sat down解释下为啥选A b](/uploads/image/z/15111729-9-9.jpg?t=____the+lecture+began.A.After+we+took+our+seats+B.After+we+have+sat+down+C.Having+been+seated+D.Having+sat+down%E8%A7%A3%E9%87%8A%E4%B8%8B%E4%B8%BA%E5%95%A5%E9%80%89A+b)
____the lecture began.A.After we took our seats B.After we have sat down C.Having been seated D.Having sat down解释下为啥选A b
____the lecture began.
A.After we took our seats B.After we have sat down C.Having been seated D.Having sat down
解释下为啥选A b
____the lecture began.A.After we took our seats B.After we have sat down C.Having been seated D.Having sat down解释下为啥选A b
B改成过去完成时After we had sat down才行,表示过去某一时间前已完成的事情.
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