- May I speak to Mr. Smith?
- Sorry he isn't in. He London on business.
A:has gone to
B:have been to
C:have gone to
D:has been to
What's that? It's a panda.
赤道地区全年高温多雨,南极大陆终年严寒少雨且温差大,导致两地气候差异的主要因素是( )
在△ABC中,AB→=2,3,AC→=k,1,A=π2,则k的值为( )