问题补充:
Although the play had already been on for 10 minutes, I was still unable to find a seat .
A. to sit
B. for sit on
C. to sit on
D. for sitting
答案:
A. to sit
B. for sit on
(答案→)C. to sit on
D. for sitting
解析:考查不定式做定语,如果不定式的动词是不及物动词,这题不定式修饰a seat,要加相应的介词,sit on the seat,句意:虽然戏剧已经开始10分钟了,我还找不到座位坐下。选C。