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

分析 這個項目被如此設(shè)計，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，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(guān)系：分詞和句子主語之間是主謂關(guān)系（主動關(guān)系），用現(xiàn)在分詞；分詞和句子主語之間是動賓關(guān)系（被動關(guān)系），用過去分詞；本題中連詞once后的begin作為及物動詞，和句子主語the project之間是被動關(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動詞；2）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．

點評 本題是要求用所給動詞的適當(dāng)形式填空，解題時首先考慮句中需要的是謂語動詞還是非謂語動詞；其次，如果是謂語動詞關(guān)注時態(tài)、語態(tài)和數(shù)的變化；如果是非謂語動詞要聯(lián)系非謂語的基本用法判斷非謂語的形式．

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