题干
— It's nice to meet you here, Alan.
— Ha, I'm ________ to see you, too.
A：late
B：happy
C：first
D：sorry
答案(点此获取答案解析）
B
— It's nice to meet you here, Alan.
— Ha, I'm ________ to see you, too.
A：late
B：happy
C：first
D：sorry
，AB=5，AC=3，则sinB的值是 