the students were asked to walk quietly and()during()in the zoo

题目

the students were asked to walk quietly and()during()in the zoo
Atalk soft;they watched
Btalk softly;their watch
Ctalk softly;they watched
Dtalk soft;their watch

答案

B吧应该是,during是介词,所以后面不能再用像A、C答案后面那样的主谓形式,至于soft,可以当做名词、形容词和副词,个人感觉应该用-ly形式,不知道回答的对不对