By the year 1889, there were just 541 bison in the whole of North America.
A. leaving alive
B. to leave alive
C. to be left alive
D. left alive
网友回答
A. leaving alive
B. to leave alive
C. to be left alive
(答案→)D. left alive
解析:考察非谓语动词.句意:到1889年在整个北美洲,只有541头还活着的北美野牛.过去分词表示被动的发生过的动作,和句子主语是动宾关系,结合语境可知选D.