The girl in the snapshot was smiling sweetly， .
A. her long hair was flowing in the breeze
B. her long hair were flowing in the breeze
C. her long hair flowing in the breeze
D. her long hair flowed in the breeze
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A. her long hair was flowing in the breeze
B. her long hair were flowing in the breeze
(答案→)C. her long hair flowing in the breeze
D. her long hair flowed in the breeze
解析：逗号不能连接两个句子，因此A、B两项不对·且B项动词应用单数形式。her long hair与flow之间为主动关系，因此用flow的现在分词形式。因此选C。