问题
选择题
When _____ help, one often says "Thank you" or "It's kind of you".[ ]
A. offering
B. to offer
C. to be offered
D. offered
答案
答案：D
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When _____ help, one often says "Thank you" or "It's kind of you".[ ]
A. offering
B. to offer
C. to be offered
D. offered
答案：D