the only way to do this.there was only one way----doing this

the only way to do this.there was only one way____doing this.1 in 2 of 3 by 4 to
请问选择哪一个,及分别说出每个为什么对与错.

记住:
the only way of doing this(介词+动名词结构) == the only way to do this （动词不定式结构）
它们两者在意思上是一样的,只是结构不同.
又如：
there is another way to solve this problem
== there is another way of solving this problem