I met a friend of mine ___ I was walking in the parkA.before B when C after D if 可不可以填when?我们老师说题出错了,只能填while,

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• I met a friend of mine ___ I was walking in the parkA.before B when C after D if when后面+一般过去时的哦~那这个怎么弄哦我们老师讲了拉 的 还有while 后面才加过去进行时！郁闷啊 一般过去时和过去进行时是不同的 2楼的~
• I met a friend of mine ___ I was walking in the parkA.before B when C after D if 可不可以填when?我们老师说题出错了,只能填while,
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