8．Unlesschanged （change），this law will make life difficult for farmers．

分析 除非被更改，這項(xiàng)法律將會使得農(nóng)民的生活艱難．

解答 答案是changed．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unless后的change和句子主語this law之間是被動關(guān)系，所以用過去分詞changed．

點(diǎn)評 本題是要求用所給動詞的適當(dāng)形式填空，解題時(shí)首先考慮句中需要的是謂語動詞還是非謂語動詞；其次，如果是謂語動詞關(guān)注時(shí)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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