He heard someone following him,and glanced round.He ________ a dark figure in the shadows.[ ]

A. lost sight of  

B. caught sight of

C. fell in love with  

D. lost touch with

社会主义制度在我国基本建立的标志是

A．中国人民政治协商会议的召开

B．三大改造的完成

C．社会主义建设总路线的制定

D．“ * * ”的结束