10．At the end of the meeting，it was announced that an agreement _____．（　�。�
A．has been reachedB．has reached
C．had been reachedD．had reached

分析 會(huì)議結(jié)束時(shí)，宣布達(dá)成了一項(xiàng)協(xié)議．

解答 C 考查被動(dòng)語態(tài)．分析句子可知，it是形式主語，that an agreement 引導(dǎo)的從句是真正的主語，在這個(gè)主語從句中reach與主語agreement之間是被動(dòng)關(guān)系，所以用被動(dòng)語態(tài)，故答案選C．

點(diǎn)評 被動(dòng)語態(tài)由"助動(dòng)詞be+及物動(dòng)詞的過去分詞"構(gòu)成．被動(dòng)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(dòng)語態(tài)是解題的關(guān)鍵．

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