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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