—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)，故用一般過去時態(tài)，主語是動作對象，故用被動語態(tài)。選D。
點評：英語中的時態(tài)主要是借助于時間狀語與上下文語境來進行判斷。解答此類題型，首先要注意句子中的時間狀語，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態(tài)。語態(tài)的判斷主要是確定句子主語與謂語動詞的關(guān)系。如果是主動關(guān)系則用主動語態(tài)，反之如果是動賓關(guān)系，則用被動語態(tài)。
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