During his visit to Cuc Phuong National Park, he discovered many kinds of rare flowers. While ____________________ Cuc Phuong National Park, he discovered many kinds of rare flowers. (WAS)
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During his visit to Cuc Phuong National Park, he discovered many kinds of rare flowers.
While __________ Cuc Phuong National Park, he discovered many kinds of rare flowers. (WAS)
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