题目

These days they          busy going over their lessons because they          an English test soon. A. have been; will have B. were; had C. were; have D. are; have 答案：A下列说法错误的是（　　）A．分解反应可能是氧化还原反应B．置换反应一定是氧化还原反应C．复分解反应有的属于氧化还原反应D．化合反应可能是氧化还原反应