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        1. —Why is the classroom so dirty?
          —Sorry,sir. It       yesterday, We forgot to do it.
          A.doesn’t cleanB.didn’t clean
          C.isn’t cleanedD.wasn’t cleaned
          D

          試題分析:句意:教室為什么這么臟?——抱歉,老師。昨天沒有打掃,我們忘記做了。結(jié)合語境可知下文描述的是過去的狀態(tài),故用一般過去時(shí)態(tài),主語是動(dòng)作對象,故用被動(dòng)語態(tài)。選D。
          點(diǎn)評:英語中的時(shí)態(tài)主要是借助于時(shí)間狀語與上下文語境來進(jìn)行判斷。解答此類題型,首先要注意句子中的時(shí)間狀語,如果沒有則要通過分析上下文,結(jié)合語境來判斷句子的時(shí)態(tài)。語態(tài)的判斷主要是確定句子主語與謂語動(dòng)詞的關(guān)系。如果是主動(dòng)關(guān)系則用主動(dòng)語態(tài),反之如果是動(dòng)賓關(guān)系,則用被動(dòng)語態(tài)。
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