The secretary worked late into the night, ______ a long speech for the president.

A．to prepare

B．prepared

C．preparing

D．to be prepared

痿证重症，若出现呼吸困难，吞咽困难，不能进食水时是何脏气极虚的表现

A．肺脾

B．肝肾

C．脾肾

D．脾胃

E．心肺