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
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
D
此处用动词不定式表目的，he与train之间是被动关系。