19．Doctor Smith，who _______in Shanghai for more than ten years，is considering working in Taizhou，but he hasn't decided yet．（　�。�
A．had workedB．has been working
C．is workingD．works

分析 Smith博士，在上海工作了十多年，正在考慮到臺州工作，但他還沒有決定．

解答 答案：B 考查現(xiàn)在完成進(jìn)行時．根據(jù)從句中的時間狀語 for more than ten years表示他在上海持續(xù)工作了十多年，還將有可能繼續(xù)工作下去，要用現(xiàn)在完成進(jìn)行時．故選B．A項：過去完成時；C項：現(xiàn)在進(jìn)行時；D項：一般現(xiàn)在時．

點評 解答此類問題要了解各種時態(tài)的基本含義，并區(qū)別各種時態(tài)之間的差異，了解某些時態(tài)的特殊用法，然后結(jié)合語境選擇正確答案．

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