—Where’s your mother ? --She has gone shopping with my aunt . She’ll be back ________.A.in a whileB.for a whichC.once in a whileD.a while
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A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。