the third photo, Li Yan at the mall.A. On; shopsB. On; shoppingC. In; is shoppingD. In;

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A. On; shops
B. On; shopping
(答案→)C. In; is shopping
D. In; is shoping
解析：in在里面；on在上面。句意：在第三张照片里，李艳正在购物中心购物。Shop是重读闭音节结尾的单词，变现在分词应双写最后一个辅音字母，故选C。