—IhaveworkedhardatEnglish,butitseemsthatIhaven’tmadeany...

問題詳情：

—I have worked hard at English, but it seems that I haven’t made any progress.

            —Keep on _____ at it, and you will be successful.

                             ing              work                 s

【回答】

B

知識點：動詞和動詞短語

題型：選擇題