He was puzzled by this phenomenon. He began to try every approach _________ the best way of working it out.
A.known to find
B.knowing to find
C.known finding
D.knowing finding
网友回答
A解析第一题选A ，原因是这里面的known 是做形容词，被知晓的。形容approach方式途径。后面的to find 接目的状语，表示目标。B knowning 动名词一般是主动意思，所以不正确。C D不能表示目的含义。