有一些课程必须在2级以前上完
have been taken 已经上完（课程）
there are courses which must have been taken before levl 2
there are courses which must have been taken before levl 2
这句话怎么翻译 尤其是have been taken
359.1
这句话怎么翻译 尤其是have been taken
359.1
英语人气：883 ℃时间：2019-10-11 05:44:25
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