Kim, give me your report by 1O am. have you been in charge of this project?A. Since when B. By whomC

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【题目】--Kim, give me your report by 1O am.

--__ have you been in charge of this project?

A. Since when B. By whom

C. For what D. From where

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【答案】A

【解析】句意：--Kim，上午10点前给我你的报告。—从什么时候你负责这个项目了？题干中缺少时间状语，又用的是现在完成时，四个选项只有介词since自从与现在完成时态连用。故判断选A。