—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 
B
考查非謂語動詞。句意：我在數(shù)學(xué)上很努力，但是好像我沒有取得任何進(jìn)步�！獔猿掷^續(xù)努力，你會成功的。動名詞做賓語表示抽象的反復(fù)性動作，固定結(jié)構(gòu)keep on doing sth表示繼續(xù)做某事，on是介詞后面接名詞或者動名詞做賓語，結(jié)合語境可知選B。
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