Question

—I have worked hard at math, but it seems that I haven’t made any progress.
—Keep on _____ at it, and you will be successful.
A. work B. working  C. to work 

Answer 1

B

考查非謂語動詞。句意：我在數學上很努力，但是好像我沒有取得任何進步。——堅持繼續努力，你會成功的。動名詞做賓語表示抽象的反復性動作，固定結構keep on doing sth表示繼續做某事，on是介詞后面接名詞或者動名詞做賓語，結合語境可知選B。