Mr. Smith ________ his pupils how to prepare for the test since 8 am, but no one listens to him.
A．has told　B．is telling
C．has been telling　D．will have told
C
句意：Mr.Smith從早上8點開始就一直在不停地告訴學生們?nèi)绾螠蕚淇荚�，但沒有一個學生聽他講�？仗幍膭幼鲝倪^去某一時間開始一直延續(xù)到現(xiàn)在，可能還要繼續(xù)下去，因此應用現(xiàn)在完成進行時。故答案選C。
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