20．The Group of Eight ______ by eight of the world's wealthiest nations in 1998．（　�。�
A．was formedB．formsC．is formedD．formed

分析 八國(guó)集團(tuán)是由八個(gè)世界最富有的國(guó)家在1998組成．

解答 答案是A．考查被動(dòng)語(yǔ)態(tài)，分析句子可知The Group of Eight 是主語(yǔ)，form動(dòng)詞"組成"與主語(yǔ)形成被動(dòng)關(guān)系，1998年是過(guò)去時(shí)間，所以用一般過(guò)去時(shí)的被動(dòng)語(yǔ)態(tài)，故答案選A．

點(diǎn)評(píng) 被動(dòng)語(yǔ)態(tài)由"助動(dòng)詞be+及物動(dòng)詞的過(guò)去分詞"構(gòu)成．被動(dòng)語(yǔ)態(tài)的時(shí)態(tài)變化只改變be的形式，過(guò)去分詞部分不變．疑問(wèn)式和否定式的變化也如此．掌握各種時(shí)態(tài)的被動(dòng)語(yǔ)態(tài)是解題的關(guān)鍵．

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