11.The three men tried many times to sneak across the border into the neighboring country, _____ by the police each time. (1999)

A. had been captured B. being always captured

C. only to be captured D. unfortunately captured

（C，“这三人多次企图偷偷越过边界进入邻国，不料每次都被警察抓住。”only to表示出乎意料，通常是不愉快的结果。）

12.This missile is designed so that once ______ nothing can be done to retrieve it. (1995)

A. fired B. being fired C. they fire D. having fired

（A，once连词，一旦，被动，所以A。This missile is designed so that once it is fired …）

13. ______ , he can now only watch it on TV at home. (1998)

A. Obtaining not a ticket for the match B. Not obtaining a ticket for the match

C. Not having obtained a ticket for the match D. Not obtained a ticket for the match

（C，分词短语的动作在主句动作之前发生，用分词的完成形式。）

14.Arriving at the bus stop, ______ waiting there. (1994)

A. a lot of people were B. he found a lot of people

C. a lot of people D. people were found

（B，空处的逻辑主语与arrive保持一致。）

15._____ regular training in nursing, she could hardly cope with the work at first. (1994)

A. Not received B. Since receiving C. Having received D. Not having received

（D，receive的主语是she，因此应是主动，A不对；receive的动作在主句谓语动词之前发生，所以要用分词的完成形式，否定应是not having done.）