_______moreattentiontheyoungtreescouldhavegrownmuch

_______more attention, the young trees could have grown much better.

A. To give

B. Given

C. Give

D. Having given

正确答案：B
参考译文：倘若给予更多关注这些小树本来可以长得更好given表假设常与虚拟语气连用