问题: suggestions of listeners have been sent_____ the
                    suggestions of listeners have been sent_____ the radio station.
A to B off C for D in
选A不行吗?
                    
                    解答: 
                    答案就是A啊,选别的都不行的。send本身可以作为及物动词,
send sth. to表示把某物送到哪里,
不过抛开这道题,最佳答案应该是
……have been sent in to ht radio station.
send in 作为短语意为递送,递交,比较正式					
                    
    
                    
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