Parents________send their children to school when they reach six years old. A．could B．were .

Question

Parents________send their children to school when they reach six years old. A．could B．were able to C．ought to D．would

Answer 1

C

句意：当孩子满六岁时，家长应当送孩子去上学。根据语境可知，应填ought to，表示有责任，从法律或道义上“应该”做。