题目内容
— Thanks a lot, Mr. Wang. I don't know how to ________ the help you gave me during my stay here.
— It's my pleasure. Welcome to China again when you have time.
— It's my pleasure. Welcome to China again when you have time.
[ ]
A. pay off
B. pay back
C. pay for
D. pay to
B. pay back
C. pay for
D. pay to
B
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