6．On the morning of October 12，1492，Christopher Columbus and his crew came to the shores of the Caribbean islands，mistakenly believing they ________ in Southeast Asia．（　�。�
A．arrivedB．had arrivedC．has arrivedD．would arrive

分析 在1492年10月12日的早晨，哥倫布和他的船員到達了加勒比海岸，他們誤認為自己到了東南亞．

解答 答案；B．因為arrive發(fā)生在mistakenly believing 之前，表示"過去的過去"，所以用過去完成時態(tài)．所以答案是B．其他選項的時態(tài)分別是A一般過去時態(tài)；C選擇完成時態(tài)；D過去將來時態(tài)．

點評 考查過去完成時態(tài)．
過去完成時（The Past Perfect Tense）：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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