---What time do you expect me back,mom?---Say,____half an hourA.at B.before C.in D.for

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---What time do you expect me back,mom?---Say,____half an hourA.at B.before C.in D.for
---What time do you expect me back,mom?---Say,____half an hour
A.at B.before C.in D.for

---What time do you expect me back,mom?---Say,____half an hourA.at B.before C.in D.for
in
in表示在某段时间内
句意是 --妈妈 你要我多会回家 妈妈回答说--在一个半小时之内