Will you join us to play basketball on Saturday afternoon?- but I planned to go

问题补充：

--- Will you join us to play basketball on Saturday afternoon?

------ ,but I planned to go swimming with Eric.

A. Never mind

B. Many thanks

C. Take it easy

D. No problem

答案：

A. Never mind

(答案→)B. Many thanks

C. Take it easy

D. No problem

解析：句意：---星期六下午你会加入我们中来打篮球吗？---太感谢了，不过我计划跟艾瑞克一起去游泳。Never mind意思是“没关系”； Many thanks意思是“万分感谢”； Take it easy意思是“不要紧张，别着急”； No problem意思是“没问题”。结合题意，应该选B。