第1个回答 2010-11-16
it will make us finish the mission in advance if the new method is used
第2个回答 2010-11-16
The new method makes it possible for us to complete the task in advance
第3个回答 2010-11-16
The new method makes it possible (for us) to fulfill the task ahead of schedule.
根据具体语境,method可替换为approch,technique等, task可替换为work等词。
不强调主体的话可去掉for us