Tell the boy that he ___ in the

Tell the boy that he ___ in the river.
A、swims
B、swim
C、swimming
D、to swim
【正确答案】：B
【题目解析】：Tell the boy that he (should)_not swim__ in the river.
语法：1 tell sb that he (should) (not) do sth.
2 that 后面是tell的宾语从句,要用虚拟语气,即should+动词原形,其中should可省略.