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，“這三人多次企圖偷偷越過邊界進入鄰國，不料每次都被警察抓住。”only to表示出乎意料，通常是不愉快的結果。）
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連詞，一旦，被動，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，分詞短語的動作在主句動作之前發生，用分詞的完成形式。）
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，空處的邏輯主語與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的主語是she，因此應是主動，A不對；receive的動作在主句謂語動詞之前發生，所以要用分詞的完成形式，否定應是not having done.）
