题干
— Alice came back home the day before yesterday.
— Really ? Where _____?
— Really ? Where _____?
A：has she bee
B：had she bee
C：has she gone
D：had she gone
答案(点此获取答案解析）
B
的图像分别与x轴、y轴交于A、B，已线段AB为边在第一象限内作等腰Rt△ABC，使∠BAC=90°． 