题干
—Hello, nice to meet you.
—_________.
A：Hello, good morning
B：Hi, good afternoon
C：Fine, thank you
D：Hello, nice to meet you, too
答案(点此获取答案解析）
D
—Hello, nice to meet you.
—_________.
A：Hello, good morning
B：Hi, good afternoon
C：Fine, thank you
D：Hello, nice to meet you, too
、
、
两两所成的角相等，且
，
，
，则
等于