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255. The college entrance examination is drawing near and all the students are ploughing through their studies. What does the underlined part means _____.

255. The college entrance examination is drawing near and all the students are ploughing through their studies. What does the underlined part means _____.

A. learning to plough                         B. studying hard    

C. ploughing the field                        D. studying the plough

255. The college entrance examination is drawing near and all the students are ploughing through their studies. What does the underlined part means _____.