My sister bought this pair last month.Did she buy them here?

My sister bought this pair last month.Did she buy them here? 懂英语的请进But my sister bought this pair last month.下面一句是 Did sh my sister bought this pair last month .这句话为什么不在时间前面加上介词on 按要求改写句子My sister bought this pair last month.（对划线部分提问,last m 简单的英语问题My sister bought this cake last month不用再last month 前边 My sister bought this pair( last mouth)对打括号部分提问 I bought my shoes this year ;my sister bought hers last year my uncle bought a()car last month. My sister bought (she) a beauiful last Sunday she的形式 英文改错 did you bought a car last month. Ann ________ here.She left last month. This pair of shoes ( )my sister's.