题目内容
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
D
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。
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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