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(tái)州工作，但他還沒(méi)有決定．

解答 答案：B 考查現(xiàn)在完成進(jìn)行時(shí)．根據(jù)從句中的時(shí)間狀語(yǔ) 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(shí)．故選B．A項(xiàng)：過(guò)去完成時(shí)；C項(xiàng)：現(xiàn)在進(jìn)行時(shí)；D項(xiàng)：一般現(xiàn)在時(shí)．

點(diǎn)評(píng) 解答此類(lèi)問(wèn)題要了解各種時(shí)態(tài)的基本含義，并區(qū)別各種時(shí)態(tài)之間的差異，了解某些時(shí)態(tài)的特殊用法，然后結(jié)合語(yǔ)境選擇正確答案．

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