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
网友回答
D解析由句意知他被送到那儿的目的是培训，故用不定式表目的，而且他与train之间是被动关系，故用不定式的被动语态，A项一般用作原因，B项一般用作定语。
本题考查非谓语动词的用法，难度较大。非谓语动词的用法是历年高考必考项目之一，要重点掌握。