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4．The hostess of the party，who__________ as a doctor for five years，is president of a famous private school．（　　）
A．workedB．has workedC．worksD．had worked

分析 今天聚會的女主人曾經當過五年醫生，現在是一所很出名的私立學校的校長．

解答 答案：A
該題考查一般過去時的運用，根據句意可知，女主人現在的職業是一所私立學校的校長，那么as a doctor for five years"當過五年醫生"則為女主人以前的經歷，為發生在過去的事情，所以應用一般過去時，該題最大干擾項為B選項現在完成時，但是現在完成時表示動作發生在過去對現在造成一定影響（題中未提及）或動作發生在過去且還有可能延續下去（當醫生的經歷已結束），兩項均不符合，所以不能用現在完成時，故選A．

點評 考查時態時，要注意句中表示時間的成分對時態的提示，如果沒有明確的時間提示，則可以通過句中邏輯關系來確定時態．

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