问题
选择题
People in developed countries are supposed ____ more healthy food before than what they have today.
A．to be had
B．to have
C．had
D．to have had
答案
答案：D
考查非谓语动词。句意：发达国家的人们以前应该享有便现在更健康的食品。不定式表示具体的动作，如果动作发生在谓语动词之前，则要用完成时态的不定式，故选D。