Faced with a difficult math problem, ________．
A.it was given upB.it was solved by her teacherC.the girl asked the teacher for helpD.the teacher helped the girl out在线课程C
解析：
Faced with a difficult math problem是分词做原因状语，其逻辑主语应当是主句的主语the girl．即这个女孩面对一道数学难题。
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