12．The manager ___ the workers how to improve the program since 9a．m．（　　）
A．has toldB．is telling
C．has been tellingD．will have told

分析 句意：自上午9點(diǎn)以來(lái)，經(jīng)理一直在告訴工人們?nèi)绾蝸?lái)改善這個(gè)項(xiàng)目．

解答 答案C． have/has been doing 表示過(guò)去發(fā)生的某個(gè)動(dòng)作一直持續(xù)到現(xiàn)在，可能剛剛結(jié)束，還可能繼續(xù)持續(xù)下去．根據(jù)句意，自從上午9點(diǎn)以來(lái)，經(jīng)理一直告訴工人們?nèi)绾蝸?lái)改善這個(gè)項(xiàng)目．是過(guò)去發(fā)生的動(dòng)作，可能還會(huì)繼續(xù)持續(xù)下午，故選C．

點(diǎn)評(píng) 本題是基礎(chǔ)題，考查現(xiàn)在完成進(jìn)行時(shí)，要掌握該時(shí)態(tài)的具體用法并結(jié)合具體的語(yǔ)境選擇出正確選項(xiàng)．

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