【題目】The manager _______ his 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】句中出現(xiàn)since 9 am一直到現(xiàn)在，要用現(xiàn)在完成進(jìn)行時(shí)。

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