If the bottle of gas______fire,the whole building may ____.
问题描述：
If the bottle of gas______fire,the whole building may ____.
A.will catch...be burned to the ground
B.catches...be burned down
C.is on...burn down
D.will be on...be burned down
为什么是B呢
答
题目意思是------要是这一罐气体着火,整个建筑物将会被烧毁.
catche fire固定短语,着火,burned down 固定短语,烧毁.建筑物不会自己烧毁,只能被烧毁,所以用被动语态