The airline company, following through on recent warnings that it might start reducing service, announced that it was eliminating jet service to nine cities, closing some unneeded operations, and it grounded twenty-two planes.
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Aclosing some unneeded operations, and it grounded
分析该选项
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Bclosing some unneeded operations, and grounding
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Cwas closing some unneeded operations, while it grounded
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Dit closed some unneeded operations and grounded
分析该选项
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Eit was closing some unneeded operations, and grounding
分析该选项