求老师解答：—Thanks a lot,Mr.

求老师解答：—Thanks a lot,Mr.
—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.		 [ ]
A.pay off
B.pay back
C.pay for
D.pay to
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B

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