Question

—I expected him to be nervous before his speech, but he was as cool as a cucumber.
—He _______ it carefully.

A．could have prepared	B．shouldn’t have prepared
C．must have prepared	D．can’t have prepared

Answer 1

C

解析试题分析：考查情态动词+完成式的用法：A.could have done过去可能做了什么B. shouldn’t have done本不该做而做了， C. must have done一定已经做了，D. can’t have done过去不可能做了，句意：--我以为他在演讲前紧张，但是他很冷静。--他一定准备的很充分。选C.
考点：考查情态动词+完成式的用法
点评：情态动词+完成式要注意把握时间概念。情态动词无论是表达“推测和可能性”，还是表达“虚拟”这一概念，只要是对过去已经发生的事情进行描述，一律用“情态动词+have done”这一结构；对现在或将来的事情进行描述，用“情态动词+动词或系动词原形”。