Morethan3000trees________inthisar

发布时间:2020-07-09 13:44:15

More than 3000 trees ________ in this area by the end of last year.













A.have been planted












B.had planted











C.were planted











D.had been planted

网友回答

D解析由时间状语by the end of last year可知,主句应用过去完成时形式;trees与plant之间是被动关系,故用过去完成时。
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