68. A new technique ______ , the yields as a whole increased by 20 per cent. A)working out B) having worked out C)having been worked out D)to have been worked out
热心网友
A 这是语感 念书多了就有这种感觉 抱歉 具体的我不是很清楚 不过我敢肯定就是这个答案
热心网友
agree
68. A new technique ______ , the yields as a whole increased by 20 per cent. A)working out B) having worked out C)having been worked out D)to have been worked out
A 这是语感 念书多了就有这种感觉 抱歉 具体的我不是很清楚 不过我敢肯定就是这个答案
agree