Tokilltime,theoldmansatinfrontofthetelevision,happy

問題詳情：

 To kill time, the old man sat in front of the television, happy _____ anything that happened to be on, switching from one channel to another.

A.      to watch         B. watching   C watched            D to have watched

【回答】

A

知識點：非謂語動詞

題型：選擇題