【题目】He gave us a lot of help when we were in trouble, but we have nothing to give him ________.
A.in danger
B.in need
C.in return
D.in fact

【答案】C
【解析】句意：在我们困难的时候他给了许多帮助，但我们无以回报。A. in danger处于危险中；C. in need需要；C. in return作为回报；D. in fact事实上。根据句意，所以答案是C。