有一些課程必須在2級以前上完
have been taken 已經(jīng)上完（課程）
there are courses which must have been taken before levl 2
there are courses which must have been taken before levl 2
這句話怎么翻譯 尤其是have been taken
359.1
這句話怎么翻譯 尤其是have been taken
359.1
英語人氣：201 ℃時間：2019-10-11 05:44:25
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