来自李凯里的问题
【MumputthepresentsroundtheChristmastreethedaybeforeyesterday．（改为被动语态）Thepresents______roundtheChristmastreebyMumthedaybeforeyesterday．】
Mum put the presents round the Christmas tree the day before yesterday．（改为被动语态）
The presents______ round the Christmas tree by Mum the day before yesterday．
