问题
选择题
—Has Ham started out? He said he would join in the party.
—He ____. He is a man who always keeps his word.
A．must have left
B．need have left
C．should have left
D．could have left
答案
答案：A
考查情态动词+have done，A是过去一定做了，B是过去本有必要做却没做，C是过去本应该做却没做，D是过去本可以做却没做，句意是：--Ham出发了吗？--他说他会参加聚会的。--他一定已经走了，因为他是守信的人。选A。