_______onyourstudy,andyouwillmakegreaterprogress．      ...

問題詳情：

_______ on your study, and you will make greater progress．

       A．Concentrating                                          B．If you concentrate   

       C．Concentrate                 D．To concentrate

【回答】

C

知識點：非謂語動詞

題型：選擇題