_____ in thought completely, he didn’t even know what was going on.
A. Losing B. Lost C. Having lost D. Having been lost
_____ in thought completely, he didn’t even know what was going on.
A. Losing B. Lost C. Having lost D. Having been lost
B
句意强调主语沉思,而不知道下一步将要做什么事情。由主语he,我们可知应用主动语态,排除选项D;Having lost表示动作发生在主语动作之前,不和题意,排除C;过去分词作形容词,可以表示主语所处的一种状态,符合题意。