听力软件，长对话“两人讨论论文”。

听力软件，长对话“两人讨论论文”。
what can i do to repay you?
you want wrap up my chemist lab for me?
i'd love tol but i've never taken chemistry.so i'm not sure you like teh results.
oh, well no thanks necessary then. have a good weekend. and try to get out of the library and get some sleep. you have big circles under your eyes.

why doesn't the woman want any help from the man?

C  he's already helped her enough.
D  she doesn't need any help.
这道题答案选D ，为什么不是C呢？？

答案是D,

因为，男生没有学过化学，所以他帮不了女生。女生当然也就是说说罢了，自然是不指望他能帮忙了。

C说，男生已经帮了女生不少忙了，对话中没有提到，所以不对。