more time and attention you can do it much better next time.A. GiveB. GivingC. To giveD.

问题补充：

more time and attention, you can do it much better next time.

A. Give

B. Giving

C. To give

D. Given

答案：

A. Give

B. Giving

C. To give

(答案→)D. Given

解析：根据下文可知，此处考察虚拟语气。Given前省略if you had，故选D，如果投入更多的时间及注意力，下次你能做的更好。