people watched Shenzhou Ⅸ spacecraft into space successfully in the world.

A. Billion B. Billions

C. Billion of D. Billions of

D 【解析】句意：世界上數(shù)十億人觀看了神舟飛船成功進入太空。billion名詞，十億；固定搭配billions of，意為“數(shù)十億”，表示約數(shù)。故選：D。
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