---The window is dirty.
----I know. It ______ for weeks.

A．hasn’t cleanedB．didn’t cleanC．wasn’t cleanedD．hasn’t been cleaned

D

解析試題分析：表示過去某一動(dòng)作或行為一直持續(xù)到現(xiàn)在，用現(xiàn)在完成時(shí)，又因?yàn)橹髡Z“It”與動(dòng)作“clean”之間是被動(dòng)關(guān)系，故用現(xiàn)在完成時(shí)的被動(dòng)語態(tài)。
考點(diǎn)：時(shí)態(tài)與語態(tài)考查題
點(diǎn)評：英語中的時(shí)態(tài)主要由動(dòng)詞的形式?jīng)Q定，因此在學(xué)習(xí)英語時(shí)態(tài)時(shí)，要注意分析動(dòng)詞形式及具體語境，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。對于語態(tài)，主語和動(dòng)作之間是主動(dòng)關(guān)系，就用主動(dòng)語態(tài)，如果主語和動(dòng)作之間是被動(dòng)關(guān)系，就用被動(dòng)語態(tài)。

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