19．Unfortunately，by the time I got there，the bus ______．（　�。�
A．had leftB．have leftC．leftD．is leaving

分析 不幸的是，當(dāng)我到那的時候，公車已經(jīng)離開了．

解答 答案：A．
結(jié)合句意get和leave兩個動作，leave先發(fā)生，也就是過去的過去，故用過去完成時had+過去分詞，leave的過去分詞left，故答案是A．

點(diǎn)評 過去完成時表示過去某一時間或動作以前已經(jīng)發(fā)生或完成了的動作對過去的某一點(diǎn)造成的某種影響或是結(jié)果，用來指在另一個過去行動之前就已經(jīng)完成了的事件．它表示動作發(fā)生的時間是"過去的過去"，側(cè)重事情的結(jié)果．

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