A-A+ Tell me since when he ______ in your school. A 2022-08-06 07:19:48 问答库 阅读 177 次 问题详情 Tell me since when he ______ in your school. A. taught B. has taught C. teaches D. had taught 参考答案 正确答案：B19．答案为B 句中since when表示从何时起到现在为止，句中谓语要用现在完成时态。
