问题
选择题
I'm very grateful for your help and hope that someday I may be able to do something for you___． [ ]
A. in exchange
B. in turn
C. in vain
D. in particular
答案
答案：B
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I'm very grateful for your help and hope that someday I may be able to do something for you___． [ ]
A. in exchange
B. in turn
C. in vain
D. in particular
答案：B