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點以來，經(jīng)理一直在告訴工人們?nèi)绾蝸砀纳七@個項目．

解答 答案C． have/has been doing 表示過去發(fā)生的某個動作一直持續(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點以來，經(jīng)理一直告訴工人們?nèi)绾蝸砀纳七@個項目．是過去發(fā)生的動作，可能還會繼續(xù)持續(xù)下午，故選C．

點評 本題是基礎(chǔ)題，考查現(xiàn)在完成進行時，要掌握該時態(tài)的具體用法并結(jié)合具體的語境選擇出正確選項．

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