—Shall I help you with the math problem?—.A. If you wishB. With pleasureC. You're welcomeD

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(答案→)A. If you wish
B. With pleasure
C. You're wele
D. That's right
解析：A 考察情景交际。句义：—要不要我帮你解决这道数学题？—如果你愿意.If you wish如果你愿意。with pleasure很乐意，答应别人做某事；you are wele不用谢。That is right没错。根据句义说明A正确。