问题
选择题
I'm very grateful for your help and hope that some day I will be able to do something for you________.[ ]
A. in exchange
B. in turn
C. in return
D. in particular
答案
答案：C
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I'm very grateful for your help and hope that some day I will be able to do something for you________.[ ]
A. in exchange
B. in turn
C. in return
D. in particular
答案：C