---Would you like me to help you with the maths problem?
---___________ It’s a most difficult one.A.With pleasureB.Why not?C.That’s all rightD.It’s my pleasure.
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B解析说话者是主动地向对方提供帮助,那么,对方的答语只能是B项,表欣然同意。A项意思是I’ll do that with pleasure或I’m glad to do that。C项表“没关系、不客气”与对话的逻辑意义不符。D项表乐意地为某人做过了某事。