题干
Look! Some children ________ in the river. Let's go and join them.
A：swim
B：are swimming
C：will swim
D：swims
答案(点此获取答案解析）
B
Look! Some children ________ in the river. Let's go and join them.
A：swim
B：are swimming
C：will swim
D：swims
表示的图形是（ ）