— Did you see Dr Ma yesterday afternoon?
— No. When I got to his office, he ______ already.
A．left B．has left
C．was leavingD．had left
D

試題分析：句意：昨天下午你看見馬博士了嗎？——沒有，當(dāng)我到達(dá)他的辦公室時(shí)，他已經(jīng)離開了。結(jié)合語境可知下文描述的是過去某時(shí)前已經(jīng)完成的動(dòng)作，故用過去完成時(shí)態(tài)。選D。
點(diǎn)評：英語中的時(shí)態(tài)主要是借助于時(shí)間狀語與上下文語境來進(jìn)行判斷。解答此類題型，首先要注意句子中的時(shí)間狀語，如果沒有則要通過分析上下文，結(jié)合語境來判斷句子的時(shí)態(tài)。
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