As is known to us all, the television is a very important instrument of communication, ________ us to see as well as to hear the performer．

A.permitted

B.to permit

C.permitting

D.permit

答案及解析： C

分析句子成分可知主语是the television，连系动词是is，表语是a very important instrument of communication。主语和空格处的动词构成主谓关系，应该选择现在分词。A项表示被动；B项表示将来；D项常作谓语动词，故选择C项。