You’ll have to wait ________ a while, as the doctor will finish the operation ________ a moment．

A.at; in

B.for; in

C.for; after

D.after; in

答案及解析： B

解析：

wait for a while意为“等一会儿”，表示动作持续；

in a moment意为“过一会儿后”，表示动作将要发生。