I called the airline to my flight reservation a week before I left for Canada.A. expand B

问题补充：

I called the airline to my flight reservation a week before I left for Canada.

A. expand

B. book

C. confirm

D. strengthen

答案：

A. expand

B. book

(答案→)C. confirm

D. strengthen

解析：考查动词辨析：A. expand扩大，B. book预定，C. confirm证实，D. strengthen加强，句意：在我动身去加拿大之前我打电话到机场确认我的航班预定。选C。