简单的英语问题My sister bought this cake last month不用再last month 前边

简单的英语问题My sister bought this cake last month不用再last month 前边 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 My sister bought this pair last month.Did she buy them here? 按要求改写句子My sister bought this pair last month.（对划线部分提问,last m my uncle bought a()car last month. this month.next month.last month. This is the car, _______we bought last month. 英语句型转换The computer was bought by my father last month (改为主动主 英语：Where_____your sister last month?She____in china.A.was,wa 改为被动语态：my mother made a big cake last month The house,which we bought last month,is very nice.This is th