题干
______ each other for long, the two brothers decided to meet soon.
A：Not see
B：Not having see
C：Having not see
D：Not seeing
答案(点此获取答案解析）
B
A：Not see
B：Not having see
C：Having not see
D：Not seeing
”和“ 
”表示两种不同的原子．则该反应( ) 