16．Miss Rice once       music in a public school for years and now is an actress．（　�。�
A．had taughtB．has taught
C．taughtD．has been teaching

分析 Rice小姐曾經(jīng)在一所公立學(xué)校 教音樂多年，現(xiàn)在是一名演員．

解答 答案是C．本題考查過去時；由"once曾經(jīng)"和下文"Rice小姐現(xiàn)在是演員"可知，她在公立學(xué)校教音樂是"過去"，故空格處需要的是過去時，答案選C．

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

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