They had a wonderful time .A. chat on the InternetB. chatting on the InternetC. chat in

问题补充：

They had a wonderful time .

A. chat on the Internet

B. chatting on the Internet

C. chat in the Internet

D. chatting in the Internet

答案：

A. chat on the Internet

(答案→)B. chatting on the Internet

C. chat in the Internet

D. chatting in the Internet

解析：

试题分析: 句意：他们在网上聊天过得很开心。On the internet,在互联网上，chat聊天，本句为现在分词做定语，故选B。