Sam ( )here half an hour ago

Sam ( )here half an hour ago He was here().A.half an hour before B.half hour ago C.half a bought two expensive dictionaries here half an hour ago ,but They left here half an hour ago.(同意句转换) they were here about half an hour ago the bus arrive here half an hour ago . lt is here now 的同义句是什 half an hour ago 什么意思? when ()it ()?(arrive) half an hour ago The bus arrived here half an hour ago.改为同义句 Mr.Johnson arrived here about half an hour ago.(对划线部分提问）划线部分 Sorry,I ordered my food half an hour ago.对“half an hour ago” When did the train ___ Half an hour ago