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