a child will （ ） half an hour of your complete attention

a child will （ ） half an hour of your complete attention a half of an hour they will go back () A after half an hour B in half an hour half an hour or a half hour? a half hour还是half an hour? They will be back ____.A.for half an hour an hour and half还是an hour and a half half an hour 和a half hour有什么区别? a half hour later\after half an hour\after half an hour late it will take about half an hour to prepare your dishes （abou half an hour,half hour,a half hour哪些对,那些错 they walked for.A,an hour B.half a hour C,half an hour 选哪个