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

分析 八國集團(tuán)是由八個(gè)世界最富有的國家在1998組成．

解答 答案是A．考查被動語態(tài)，分析句子可知The Group of Eight 是主語，form動詞"組成"與主語形成被動關(guān)系，1998年是過去時(shí)間，所以用一般過去時(shí)的被動語態(tài)，故答案選A．

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

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