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
答案:D
解析:
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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