下列哪种菌痢病人常是两年痢疾发病高峰的桥梁（）

A.急性典型痢疾

B.病原携带者

C.中毒性痢疾

D.慢性病人

E.急性非典型痢疾

We shall fulfill your order according to the remarks in our last letter if we do not hear from you ______ the contrary.

A．in

B．to

C．on

D．with