___from space, the earth looks like a blue ball A seeing B seen C to see D seeThere are three days__before the task is finishedA leaveB to leaveC keftD leaving谁帮知道,速度呀.考试中、、、、
问题描述：
___from space, the earth looks like a blue ball A seeing B seen C to see D see
There are three days__before the task is finished
A leave
B to leave
C keft
D leaving
谁帮知道,速度呀.考试中、、、、
答
B
C