The house is dirty because it  since they moved out.
A.doesn’t cleanB.isn’t cleanedC.hasn’t cleanedD.hasn’t been cleaned
D

試題分析:考查時(shí)態(tài):句意:房子很臟,因?yàn)樽詮乃麄儼岢鋈チ艘恢睕](méi)有被打掃。時(shí)間狀語(yǔ)是since連接的時(shí)間狀語(yǔ)從句,和現(xiàn)在完成時(shí)連用,因?yàn)閠he house和clean是被動(dòng)關(guān)系,用現(xiàn)在完成時(shí)的被動(dòng)。選D。
點(diǎn)評(píng):英語(yǔ)中的時(shí)態(tài)主要由動(dòng)詞的形式?jīng)Q定,因此在學(xué)習(xí)英語(yǔ)時(shí)態(tài)時(shí),要注意分析動(dòng)詞形式及具體語(yǔ)境,想象在那個(gè)特定的時(shí)間動(dòng)作所發(fā)生的背景,這個(gè)動(dòng)作是經(jīng)常性動(dòng)作、一般性動(dòng)作、進(jìn)行性動(dòng)作、完成性動(dòng)作還是將要發(fā)生的動(dòng)作。這題的關(guān)鍵是since連接的時(shí)間狀語(yǔ)從句。
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