题目内容
China, one of the largest countries in the world, which used to _______ resources, is facing the problem of resource shortage.
A. lack of B. be abundant in
C. filling in D. being full of
【解析】选B。句意:中国作为世界大国之一,过去资源丰富,现在却面临资源缺乏的问题。used to+动词原形,表示“过去常常”。be abundant in在……方面丰富。

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