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17．This river ______ up by the cleaners every week．（　�。�

A．

is cleaned

B．

cleans

C．

cleaned

分析河每周都由清潔工人清理．

解答答案：A．結合every week可知表達的是經常性的動作，故用一般現在時，主語this river是clean的承受者，故用一般現在時的被動語態be+過去分詞，主語三單，故is，故答案是A．

點評被動語態由"助動詞be+及物動詞的過去分詞"構成．被動語態的時態變化只改變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．

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