问题补充：
We’re leaving at six o’clock, and hope most of the journey by lunch time.
A. to do
B. to have done
C. to make
D. to have made
答案：
A. to do
(答案→)B. to have done
C. to make
D. to have made
解析：不定式的完成式用来表示这个动作发生在谓语动作之前，或是表示该动作已完成。此题中的不定式的完成式表示的正是该动作的完成，因此这句话可改写为:We’re leaving at six o’clock,and hope that we will have done most of the journey by lunch time.
