10．First aid does really save lives when__________properly and timely．（　�。�
A．performingB．to performC．performedD．perform

分析 如果恰當(dāng)及時(shí)，急救確實(shí)能夠救命．

解答 答案是C．本題考查"連詞+分詞"的結(jié)構(gòu)．"連詞+分詞"的結(jié)構(gòu)在句中往往做狀語，屬于分詞做狀語；分詞做狀語時(shí)分詞的選擇是看分詞和句子主語之間的關(guān)系：分詞和句子主語之間是主謂關(guān)系（主動(dòng)關(guān)系），用現(xiàn)在分詞；分詞和句子主語之間是動(dòng)賓關(guān)系（被動(dòng)關(guān)系），用過去分詞；本題中連詞when后的perform 和句子主語first aid之間是被動(dòng)關(guān)系，所以答案選擇C．注意區(qū)別，"疑問詞+to do"在句中起著名詞作用，做主語、賓語或表語，而"連詞+分詞"在句中充當(dāng)狀語．

點(diǎn)評(píng) 首先判斷選項(xiàng)中的動(dòng)詞在句中是以謂語還是非謂語形式出現(xiàn)，然后根據(jù)選項(xiàng)在句中的功能結(jié)合非謂語的基本用法做出合理的判斷．

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