Audiences were greatly by the video class about weightless conditions in Tianggon-1 spac

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A. impressing; presenting
B. impressed; presenting
C. impressing; presented
(答案→)D. impressed; presented
解析： 考查impress的用法与非谓语动词。Be impressed by 对，，印象深刻。题意为 观众对无重力条件天宫一号所呈现的影像课印象深刻。Condition 与present 之间是被动关系，故过去分词做后置定语。故选 D项。
考点  impress的用法与非谓语动词