题目

计算：|﹣|+（﹣1）2019+2﹣1﹣（2﹣）0+2cos45°． 答案：解：原式＝﹣1+﹣1+2×＝﹣1 _________in the IT company, David decided to say goodbye and start his own business.   A. Having ignored   B. To be ignored  C. Ignored   D. Ignoring