If you do not safety the door it is possible that strong winds will cause damage to the structure. 如果你不锁好门，强风可能会对结构造成破坏。
A.lf you do not safety the door, strong winds must cause damage to the structure. B.lf you do not safety the door, damage to the structure due to strong winds is acceptable. C.lf you do not safety the door, damage to the structure due to strong winds is probable.正确答案C
