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
根据句意可以得知when之后省略了one is。
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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
根据句意可以得知when之后省略了one is。