问题描述：
英语题!句型
1.When he got to the station, only _to find_ that the train was pulling out .这里为什么用to find?
2.By the end of next month, we_ will have found_ a good solution to the technical problem.这里为什么用will have found?
1.When he got to the station, only _to find_ that the train was pulling out .这里为什么用to find?
2.By the end of next month, we_ will have found_ a good solution to the technical problem.这里为什么用will have found?
问题解答：
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