题干
— I think the waiter has forgotten us. We ________ here for over half an hour!
— I think you’re right. He probably thinks we have already ordered.
— I think you’re right. He probably thinks we have already ordered.
A：are waiting
B：have been waiting
C：have waited
D：will wait
答案(点此获取答案解析）
B
}={0，a2，a+b}，则a2010+b2011的值为 （ ）
