Question

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

1. A.
   chatting and to laugh
2. B.
   to chat and to laugh
3. C.
   chatting and laughing
4. D.
   chatted and laughed

Answer 1

C
考查非谓语动词。句意：一些人坐在草地上，其他人在湖边散步，聊天，哈哈大笑。现在分词表示句子主语正在进行的伴随性动作，故选C。