—Where’s your mother ?She has gone shopping with my aunt . She’ll be back .A. in a whil

问题补充：

—Where’s your mother ?

--She has gone shopping with my aunt . She’ll be back .

A. in a while

B. for a which

C. once in a while

D. a while

答案：

(答案→)A. in a while

B. for a which

C. once in a while

D. a while

解析：考查情景交际和短语辨析。in a while“一会儿，过不久”；for a while“暂时”；once in a while“有时”。句意“你的妈妈在哪里？”“他和阿姨去购物了，一会儿就回来。”in a while与将来时连用。故选A。