Somepeoplearesittingonthegrass;othersarewalkingalongth...

問題詳情：

 Some people are sitting on the grass; others are walking along the lake, ______ .

A. chatting and to laugh   B. to chat and to laugh     

C. chatting and laughing D. chatted and laughed

【回答】

C

知識點：非謂語動詞

題型：選擇題