1.They have made the oil and water_____from each other.
a.to separate b.separate c.to be separated d.to have separated
因为答案中没有separated,所以想知道是不是要考make sth done 变形,不知道有没有make sth to be done/to have done的说法.
2.would you be____to step this way,please?
a.too kind b.so kind c.so kind as d.as
这里的so...as 不应该是否定同级比较,还是要考as to的用法,总之没头绪
3.The satellite is always escaping from the earth_____ back by gravity the same distance it has escaped.
a.to pull b.to have been pulled c.only to be pulled d.only being pulled
也是不太清楚这里应该填什么成分,知道该填非谓语动词,觉得这几个好乱,完全没头绪.