I'd appreciate _______if you could come and help me once more and I always appreciate _______me with my English in the past.
A:this; you to help
B:that; your helping
C:it; you to help
D:it; your helping
分组
机器人数
频率
50,60)
0.08
60,70)
10
70,80)
80,90)
90,100
6
巴基斯坦重要的灌溉水源是( )