He was puzzled by this phenomenon. He began to try every approach _________ the best way of working it out.
A．known to findB．knowing to findC．known findingD．knowing finding
A
第一題選A ，原因是這里面的known 是做形容詞，被知曉的。形容approach方式途徑。后面的to find 接目的狀語，表示目標(biāo)。
B knowning 動(dòng)名詞一般是主動(dòng)意思，所以不正確。
C D不能表示目的含義。
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