Whenhecamebackthreehourslater，theywerestillsittingonthe...

問題詳情：

When he came back three hours later，they were still sitting on the sofa，________in conversation.

A．absorbing　                           B．absorbed

C．to absorb　                           D．to be absorbed

【回答】

B解析：　考查非謂語動詞。句意爲：當他三個小時後回來時，他們仍坐在沙發上，聚精會神地交談。be absorbed in爲固定搭配，意爲“專心於”，所以此處應用absorb的過去分詞形式，作伴隨狀語。

知識點：非謂語動詞

題型：選擇題