题干
. I don’t understand how you got a ticket. I always ___ you___ a careful driver.
A：think , are
B：am thinking，are
C：thought, were
D：think, were
答案(点此获取答案解析）
C
物质相互混合反应，既有气体生成，最终又有沉淀生成的是：（ ）