42选A.
55题：
A child can learn good things and bad things from TV shows.
下面讲下42题中的have sb.do sth.和have sb.doing sth的区别
have sb.do sth.
“have + sb.（宾语）+ do sth.（宾语补足语）”意为“让 / 叫 / 使某人做某事”.此结构中的 have 是使役动词,sb.作宾语,其后的 do sth.是省去 to 的动词不定式作宾语补足语.例如：
The boss often has them work for 14 hours a day.
老板经常要他们一天工作14 个小时.
I'll have someone repair the bike for you.
我会让人为你修理自行车的.
have sb./ sth.doing
“ have +sb./ sth.（宾语）+ 现在分词（宾语补足语）”意为“叫 / 让 / 使某人做某事或让某种情况发生”.宾语 sb./sth .后面用现在分词作宾语补足语,表示宾语与现在分词表示的动作之间为主动关系,且动作正在进行.例如：
Don't have the baby crying!不要让婴儿啼哭!
Don't have the dog barking much,Lilin.李林,别让狗狂吠不停.
You'd better have your car running slowly.你最好把车子开慢点.