分词作状语，可位于句首，也可位于句中，与副词的功能相同，本题中表示时间上的伴随。形式上选用现在分词还是过去分词取决于动词与主语的逻辑关系。如woken up by the noise outside，he got up to have breakfast.被外面的噪音吵醒后，他起来吃早餐。Showing respect to the teacher，he entered the classroom though the back door when he was late for lecture。出于对老师的尊重，上课迟到时，他从后门进入教室。分析该题，I是try这个动词的发出者，应使用主动语态，即现在分词。
25. By the time you get to Shanghai tomorrow, I ________ for Chongqing.
A. am leaving B. will leave C. shall have left D. had left
解答：选（C）将来完成时表示将来某时刻之前或某一行为发生之前所完成的动作。常和by或by the time等结构连用，由“will / shall + have + 过去分词”构成。例：The house will have been furnished by the end of this week.到了这个周末，房间就能布置好了。By this tomorrow， they will have repaired your computer.明天这个时候他们会把你的电脑修好的。
26. ________ he is still working on the project, I don’t mind when he will finish it.
A. In case B. As long as C. Even if D. As far as
解答：选（B）本题四个选项均可引导状语从句，as long as意为“只要”；in case意为“以防，要是”；even if意为“即使”；as far as意为“就……而言，至于”。根据句意只有B适合。例：You can go where you like as long as you get back before dark.你到哪里去都可以，只要天黑前回来。
27. If you are worried ________ the problem, you should do something about it.
A. with B. for C. on D. about
解答：选（D）worry about…是固定搭配，意为“就……而言，为……操心”。
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