【題目】— What a clean and clean and bright classroom, isn't it?
— Yes, it's always clean and bright because it _________ every day.
A.cleans
B.cleaned
C.is cleaned
D.was cleaned

【答案】C
【解析】句意：——多么干凈明亮地教室啊，是嗎？——是的，他總是干凈明亮是因為每天打掃它。it指教室，與clean之間構(gòu)成被動關(guān)系，故用被動語態(tài)。every day是一般現(xiàn)在時的標(biāo)志，故選C。

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