CHILDREN ………. TOUCH THAT SWITCH .IT IS DANGEROUS A. OUGHT TO B. MUS...

3. - DE KIEM TRA DINH KY HOC KY K7K8 HAY
DE KIEM TRA DINH KY HOC KY K7K8 HAY
3. children ………. touch that switch .It is dangerous A. ought to B. musn’t C. ought not to D. doesn’t have to