单选题：根据录音，选择合适的答案()

题目内容：

根据录音，选择合适的答案() A．Sheforgetswhattheyhavedone．
B．Shehasbeensick．
C．Shewillhelptheman．
D．Shemissedsomeclasses．

参考答案：

答案解析：

ThecaseofBoundaryDamprojectandaseriesofadvancementsshowthatC

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