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【題目】The manager __________ the workers how to improve the program since 9 am.

A. has told B. is telling

C. has been telling D. will have told

【答案】C

【解析】句意：自從上午九點，經理一直在告訴工人們如何去改善這個程序。根據(jù)since 9 am可知設空處應該用現(xiàn)在完成時，故排除B、D兩項。又根據(jù)語境可知設空處強調動作現(xiàn)在還在進行，故答案為C項。

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