21. Only____________ succeed in learning English. A. by working hard we can

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21. Only____________ succeed in learning English. A. by working hard we can

Only by working hard we can succeed in learning English.意为
只有通过努力学习我们才能成功地学英语
by是介词 后加动名词,表示方式,意为通过、、

21. Only____________ succeed in learning English. A. by working hard we can 21. 21. 21. 21. 19.20.21. 19.20.21. 19.20.21. 21.题 20 21. 19.20.21. 19.20.21. 21.题 三角函数 21. 884/34+17*21. 英语填空17-21. 求出17.18.19.20.21. 9.1215.22.5.15.25.21.