1．Such a good opportunity，once ______，might never come again．（　�。�
A．lostB．to loseC．losingD．Loses

分析 這樣的好機(jī)會(huì)一旦失去了，也許再也回不來了．

解答 答案是A．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once后的lose 和句子主語opportunity之間是被動(dòng)關(guān)系，所以答案選擇A．

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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