若收敛，则下面命题正确的是( )．

All but one ____here just now.

A．is

B．was

C．has been

D．were

Could you tell me when ___________?

A．the train will arrive

B．does the train arrive

C．did the train arrive

D．will the train arrive

The UN should﹍﹍the establishment of Iraqi government after the war, I think.

A．take part in

B．play a leading role in

C．play a role among

D．play a important part for

要以一流的班子带出一流的队伍，一流的队伍干出一流的工作，一流的工作创造一流的业绩，就必须按照（）的方针选好公安机关领导班子。

A．革命化、年轻化、知识化、专业化

B．德才兼备、任人唯贤

C．一手抓业务，一手抓队伍

D．依法治警、从严治警

抽槽截洞的挖深以不低于水面（）m为宜。

A.5

B.2

C.6

D.7