— What are your students doing now?

— They              football. Let's go and have a look.

A．are playing

B．will play

C．is playing

D．were playing

电话银行保证金外汇买卖交易的具体功能包括：（）

A.查询服务

B.实时开仓交易和实时平仓交易

C.委托撤单

D.开立和注销保证金帐户服务

E.保证金转入和转出交易