Thank you for ______ us a lot this time.

A.helping
B.helped
C.helps
D.help
A
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科目:初中英語(yǔ) 來(lái)源:北京期末題 題型:單選題

Thank you for ______ us a lot this time.
[     ]
A.helping
B.helped
C.helps
D.help

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