In doing so Japanese are lifting a rock ______ it on their own feet.

题目

In doing so Japanese are lifting a rock ______ it on their own feet.
A only dropping B having dropped C to be dropped D only to drop
要有原因

答案

D.only + 不定式 to do,作结果状语,句子的主语 Japanese 主动 drop.全句意思是：那样做,日本人是搬起石头砸自己的脚.
再看一例：
I hurried to the train station only to find that the train had left.（我赶到火车站,结果发现火车已经开走了.我是主动发现的,所以不定式用主动形式 only to find.）
I hurried to the train station only to be told that the train had left.（我赶到火车站,结果被告知火车已经开走了.我是被告知的,所以不定式用被动形式 only to be told.）