摘要:24.B不定式的完成时用来表示这个动作发生在谓语动作之前.或是表示该动作的完成.本题中不定式的完成时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 the journey by lunch time.

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