10．Your classroom is very clean．
 Yes，it ______ every day．（　　）
A．is cleanedB．cleansC．is cleaning

分析 -你們的教室很干凈．
-當(dāng)然了，它每天被打掃．

解答 答案：根據(jù)題干中的部分it ______ every day聯(lián)系上句可知it在這里代指classroom，做句子的主語，結(jié)合選項中的動詞clean可知，主語由物充當(dāng)，它是動詞clean的動作承受者，應(yīng)該是教室被人打掃，表被動，所以此處應(yīng)用被動語態(tài)；根據(jù)時間狀語every day可知此句應(yīng)用一般現(xiàn)在時態(tài)；兩者綜合可知此句應(yīng)該用一般現(xiàn)在時的被動語態(tài)去完成，其構(gòu)成為am/is/are+動詞的過去分詞；主語為單數(shù)it，所以助動詞用is．故選A．

點評 此類題型主要是確定句子主語和謂語的關(guān)系，如果是主動關(guān)系就用主動語態(tài)；反之如果是動賓關(guān)系則要用被動語態(tài)；還要注意時態(tài)的確定．兩者有機結(jié)合就能做出正確的選擇．

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