You’ll have to wait ________ a while, as the doctor will finish the operation ________ a moment．
A.at; inB.for; inC.for; afterD.after; in在线课程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。