15.-How clean the classroom is!
--Yes,I am sure that Amy ______ it.( 。
A.is cleaningB.was cleaningC.has cleanedD.had cleaned

分析 -這個(gè)房間多干凈啊!
-是啊,我確定艾米已經(jīng)打掃過它.

解答 答案:C
根據(jù)How clean the classroom is!可知,"教室很干凈,說明已經(jīng)打掃了",強(qiáng)調(diào)對于現(xiàn)在造成的影響,應(yīng)該用現(xiàn)在完成時(shí)態(tài);現(xiàn)在完成時(shí)態(tài)的結(jié)構(gòu)為have/has+動(dòng)詞的過去分詞;又因?yàn)橹髡Z是Amy,所以助動(dòng)詞應(yīng)該用has,故選C.

點(diǎn)評(píng) 本題主要考查現(xiàn)在完成時(shí),用法:表示過去發(fā)生或完成的動(dòng)作對現(xiàn)在造成的影響或結(jié)果,還表示過去發(fā)生動(dòng)作一直持續(xù)到現(xiàn)在.其結(jié)構(gòu)是have/has+及物動(dòng)詞的過去分詞.

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