Each of the students in the playground when the bell rang.
A:has fun
B:have fun
C:was having fun
D:were having fun
i1-3i=( )
在使用显微镜观察标本时,需要从侧面看着物镜并旋转粗准焦螺旋,将镜筒下降.从侧面看着物镜的目的是( )
用情态动词填空。
You ____ hurry. There is still half an hour before the train leaves.