44.He reached the station _____ only _____ that the train had just left.
A.tired； learned B.tiring； learning C.to tire； to learn D.tired； to learn
45.--- Did that book give the information you needed?
--- Yes,but ______,we had to read it almost entirely.
A.for finding it B.to find it C.finding it D.by finding it
please explain.thank you