问题 选择题

Scientists across the world agree that this is an invention of _______ great significance, _______ invention that will greatly change human life.   

A.a; the

B.a; an

C./ ; the

D./ ; an

答案

答案:D

考查冠词。Of  great significance,固定短语,意义重大的,介词后一般不加冠词。结合上文an invention一项发明,本句和前文为并列表语,泛指任何一项发明,故用不定冠词,词首音素为元音,故选D。

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