问题

the crowded bus __________, who wasdressed in a black suit and waving to a woman
A:There are slightdifferences between 3D and 2D images
B:Pupils perform betterwhen 3D images are used in classes
C:Schools have difficultiesin making full use of 3D technology
D:add upto, add to
B:Pupils perform betterwhen 3D images are used in classes
C:Schools have difficultiesin making full use of 3D technology
D:add upto, add to
正确答案是: