【題目】The ever-growing space explorations mean that more astronauts ______.

A.requireB.was requiredC.requiredD.are required

【答案】D

【解析】

句意：日益增長的太空探索活動意味著需要更多的宇航員。

本題主要考查一般現(xiàn)在時的被動語態(tài)。根據(jù)句意，日益增長的太空探索活動意味著需要更多的宇航員。在該句由 that 引導的賓語從句中，其主語為 astronauts（宇航員），宇航員是太空探索活動中被需要的對象，故使用被動語態(tài)。同時，主句謂語 mean 為動詞原形，可推斷主句時態(tài)為一般現(xiàn)在時，故從句時態(tài)也為一般現(xiàn)在時。故正確答案為D。

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