It is ten months since he ______ a doctor.
A.becomesB.becameC.has becomeD.had become
B

試題分析:考查時(shí)態(tài)。本題是一個(gè)固定句式。Since自從…;后面的句子使用一般過去時(shí),前面的主句使用現(xiàn)在完成時(shí)或者一般現(xiàn)在時(shí);本題我們的it is可以換成it has been…;句意:自從他成為一名醫(yī)生到現(xiàn)在已經(jīng)10年了。說明他是10年前做醫(yī)生的。故B正確。
點(diǎn)評(píng):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。
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