Thousands of rockets with chemicals were fired into the sky to create the beautiful scene

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A. load
(答案→)B. loaded
C. loading
D. to load
解析：考查非谓语动词。“在亚运会上，成千上万的装满化学物质的火箭被发射到空中，为了制造漂亮的景象。”rockets和load是动宾关系，故用过去分词loaded作后置定语，相当于定语从句（which were loaded...）。故选B。