18. ---- Are you free after school? ---- Sorry. I’ve planned to treat a friend of mine to

问题补充：

18. ---- Are you free after school?

---- Sorry. I’ve planned to treat a friend of mine to dinner for his help.

A. in charge

B. in honour

C. in turn

D. in return

答案：

A. in charge

B. in honour

C. in turn

(答案→)D. in return

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