King looked for his pen _______, but he didn't find it _______.
A:somewhere; somewhere
B:anywhere; somewhere
C:everywhere; somewhere
D:everywhere; anywhere
秦朝设置三公九卿管理国政,但太尉之职务始终并未具体授人。原因应是此官职( )
已知 {x=2ky=−3k 是二元一次方程2x-y=14的解,则k的值是____
以下那条山脉对我国南北方的铁路交通建设会带来困难( )