题目内容
9. It took a long time for the rest of the people to to his famous theory.
A. catch on B. catch up
C. catch at D. catch out
9. A catch on to sth.表示"开始理解某事"。
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题目内容
9. It took a long time for the rest of the people to to his famous theory.
A. catch on B. catch up
C. catch at D. catch out
9. A catch on to sth.表示"开始理解某事"。