英语选择,求个标准答案21. arriving at the meeting room, Tina discovered that she had left the sample products in her office.A. By B. Through C. On D. In　22. Not until yesterday anything about the new adve

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英语选择,求个标准答案21. ________ arriving at the meeting room, Tina discovered that she had left the sample products in her office.A. By B. Through C. On D. In 22. Not until yesterday ________ anything about the new adve

英语选择,求个标准答案21. arriving at the meeting room, Tina discovered that she had left the sample products in her office.A. By B. Through C. On D. In　22. Not until yesterday anything about the new adve