When ____ help, you should say “thank you.” or “It is kind of you”.
A．offeringB．offeredC．To be offeredD．to offer
B

試題分析：考查狀語從句的省略：句意：當被提供幫助的時候，你應該說“thank you.”或“It is kind of you”。這是省略句，完整的句子是：When you are offered help，當主從句的主語一致的時候，可以省略從句的主語和be動詞，選B。
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