题干
33. If I_________you would drop in, I would have stayed home waiting for you.
A：have know
B：knew
C：would know
D：had know
答案(点此获取答案解析）
D
A：have know
B：knew
C：would know
D：had know
许多家庭做饭用罐装的“煤气”作燃料，罐中所装的是液化石油气，它是石油化工的一种产品．石油属于
