10. When asked why he went there,he said he was sent there       (train) for a space flight.

10. to be trained由于“他”與“訓(xùn)練”之間為被動關(guān)系，故用被動形式。另外，由于進(jìn)行飛行訓(xùn)練是他被派往那兒的目的，所以用不定式。

題目來源：2015全品作業(yè)本高中英語必修2新課標(biāo)外研版 > Period One Introduction&Vocabulary and Reading

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