12．When _______a hand，one should say"Thank you"or"It's very kind of you．"（　�。�
A．offeredB．to offerC．to be offeredD．offering

分析 當有人提供幫助時，一個人應該說"謝謝"或"你真好．"

解答 答案是A．本題考查"連詞+分詞"的結構．"連詞+分詞"的結構在句中往往做狀語，屬于分詞做狀語；分詞做狀語時分詞的選擇是看分詞和句子主語之間的關系：分詞和句子主語之間是主謂關系（主動關系），用現(xiàn)在分詞；分詞和句子主語之間是動賓關系（被動關系），用過去分詞；本題中連詞when后的offer和句子主語one之間是被動關系，所以答案選擇A．

點評 在非謂語動詞的解題中要在掌握其基本用法的基礎上關注并積累一些固定用法，結合具體語境做出合理的判斷．

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