．______was known to them all that William had broken his promise______ he would give each of them a gift.

A．As, which

B．What, that

C．It , that

D．It , which

戊型病毒性肝炎的主要传播方式是（）

A.水和（或）食物传播

B.输血和血制品

C.日常生活接触

D.母婴垂直传播

E.虫媒传播