题干
---Is there anything wrong, Bob? You look sad．
---Oh, nothing much．In fact, I ____ of my friends back home．
---Oh, nothing much．In fact, I ____ of my friends back home．
A：have just thought
B：was just thinking
C：would just think
D：will just be thinking
答案(点此获取答案解析）
B
是圆
的弦，
，则直线
