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we were delighted to find the trees planted a year before __

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we were delighted to find the trees planted a year before ____very tall,应填growing还是being grown
还是having been growing
we were delighted to find the trees planted a year before __
答案为having grown或者grown
we were delighted to find the trees( planted a year before )_having grown___very tall
这个不可能用被动being grown ,同样,看见小树正在长高可能么?除非你是神.
可以说发现小树正在被砍伐,因为看得见,但不能说正在长高,因为瞬间是看不出来的.
find后面的是一个状态,应该是已经张高了.那么自然是having grown或者grown
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