Volunteering,     asawayofbuildingcharacter,ispopulara...

問題詳情：

 Volunteering,      as a way of building character, is popular among young people in western countries.

  A. seeing                 B. to see                   C. seen                 D. being seen

【回答】

C

知識點：非謂語動詞

題型：選擇題