more attention the trees could have grown better .A. To give B. GivenC. GivingD. Having

问题补充：

more attention , the trees could have grown better .

A. To give

B. Given

C. Giving

D. Having given

答案：

A. To give

(答案→)B. Given

C. Giving

D. Having given

解析：

这题考察过去分词的用法，give attention to sth“给…足够的关注”，the trees和give是被动的关系，所以用过去分词，句意是：如果给以更多的关注，树会长的更好。选B。