_________ ,the visitors were confused by the talk about hardware and software.
A、Knowing little about computers
B、Known little about computers
C、Computers being little known
D、Had known little about computers
【正确答案】：A
【题目解析】：主语是the visitors，与know之间是主动关系，所以用ing形式，故可排除选项B；主句中的谓语动词是一般过去时，所以从句中不能用过去完成时，故可排除选项D，know little about sth.意为”对某物了解得少“。
