—I’m afraid I can’t afford a ticket to the concert so I won’t be able to go with you.—Don

问题补充：

—I’m afraid I can’t afford a ticket to the concert, so I won’t be able to go with you.

—Don’t worry. It’s my .

A. pleasure

B. treat

C. business

D. invitation

答案：

A. pleasure

(答案→)B. treat

C. business

D. invitation

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