—We’ve missed the last bus! Now We’ll have to walk home．

Yes, we       the library five minutes earlier．

A．would have left

B．must have left

C．might have left

D．should have left

樟脑酯（）

A．窝沟封闭剂稀释剂

B．窝沟封闭剂可见光固化引发剂

C．窝沟封闭剂所配酸蚀剂

D．窝沟封闭剂自凝固化引发剂

E．窝沟封闭剂树脂基质