2．The project is so designed that oncebegun（begin） nothing can be done to change it．

分析 這個(gè)項(xiàng)目被如此設(shè)計(jì)，以至于一旦開始，沒有什么東西可以改變它．

解答 答案是begun．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(yǔ)，屬于分詞做狀語(yǔ)；分詞做狀語(yǔ)時(shí)分詞的選擇是看分詞和句子主語(yǔ)之間的關(guān)系：分詞和句子主語(yǔ)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(yǔ)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begin作為及物動(dòng)詞，和句子主語(yǔ)the project之間是被動(dòng)關(guān)系，所以答案用過去分詞begun．注意：1）"連詞+分詞"的結(jié)構(gòu)中分詞前不能有任何形式的be動(dòng)詞；2）注意區(qū)別，"疑問詞+to do"在句中起著名詞作用，做主語(yǔ)、賓語(yǔ)或表語(yǔ)，而"連詞+分詞"在句中充當(dāng)狀語(yǔ)．

點(diǎn)評(píng) 本題是要求用所給動(dòng)詞的適當(dāng)形式填空，解題時(shí)首先考慮句中需要的是謂語(yǔ)動(dòng)詞還是非謂語(yǔ)動(dòng)詞；其次，如果是謂語(yǔ)動(dòng)詞關(guān)注時(shí)態(tài)、語(yǔ)態(tài)和數(shù)的變化；如果是非謂語(yǔ)動(dòng)詞要聯(lián)系非謂語(yǔ)的基本用法判斷非謂語(yǔ)的形式．

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