Mostcompanies’marketingeffortisfocusedongettingcustome...

問題詳情：

 Most companies’ marketing effort is focused on getting customers, with little attention ______ to keeping them.

  A. paying                        B. to pay                     C. paid                        D. having paid

【回答】

D

知識點：非謂語動詞

題型：選擇題