18．I didn't know Jane        in Paris．How long         here？（　　）
A．is；does she liveB．was；has she been
C．has been；is sheD．were；has she come

分析 我原先不知道Jane在巴黎．她在這兒多久了？

解答 答案是B．本題考查時態(tài)；第一句中主句動詞是過去時，賓語從句中的動詞也往往用與過去相關的時態(tài)，故排除A和C；從句主語Jane是第三人稱單數(shù)，故選用was；第二句表示"到目前為止"她在巴黎多久了，故用現(xiàn)在完成時，答案是B．

點評 對時態(tài)的選擇，要在把握時態(tài)的基本用法的基礎上，根據(jù)具體語境和題干中的時間推斷時態(tài)，同時關注特殊的結構．

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