last month （　　）忙的 for them

last month （　　）忙的 for them for last month与since last month,哪个是对的? tom is leaving for HongKong next month(怎么用last week改写） Five workers_________(被困）in the mire for 10 hour last month lily went in for an english concest last month they went to the mountains for (c ) last month 1、I ()(buy) a present for my mother last month ___your mother___(buy)any souvenirs for you last month Her grandpa ___(die) last month.He is ___(die) for a month. we haven't heard from them since last month.为什么这里不能用until啊? My sister bought this pair last month.Did she buy them here? We went on a trip for five days last month.(改为同义句）we __ __ _