more attention
______ more attention, the trees could have grown______ more attention, the trees could have grown better. A. Given B. To give C. Giving D. Having given
______ more attention, the trees could have grown better. A. Given B. To give C. Giving D. Having given 【答案】 ：D. Having given 【解析】 ：虚拟语气
选择D. Having given
Given more attention,the trees could have grown better Given more attention在这里相当一个条件壮语从句。可改写为 If it had been given more attention,the trees could have grown better. 此句是针对过去的虚拟语气，从句If it had been given more attention时态用过去完成时；主句the trees could have grown better用结构could have＋动词的过去分词． 另外，过去分词做壮语可以表被动或完成，在此表被动，the trees是动作的承受者
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