2016-2017学年人教版选修6 unit4 Global warming language points 课件 (6)-302edu教育资源网

1. So how has this come about and does it matter?

come about 是不及物短语，意为“发生”。 Please tell me how the accident _____. I am still in the dark. A. came by B. came out C. came to D. came about

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