When asked why he went there, he said he was sent there __________ for a space flight.

A．training

B．being trained

C．to have trained

D．to be trained

吸入性肺脓肿（）。

A.多为单发病灶，以段叶分布

B.常为多发病灶，两肺外带多见

C.肺部病变继发感染所致

D.肺结核空洞继发感染

E.肺脓肿直接蔓延