单选题 John said that he didn’t quite_____ and asked me to repeat what I had said.无

【正确答案】 C

【答案解析】句意：约翰说他不太明白，要求我重复我说过的话。 catch on理解，明白。 snatch up夺取，抓起。 summon up鼓起，唤起。 watch out小心。