Question

He ___________ unwisely, but he was at least trying to do something helpful.

A．may have acted	B．must have acted
C．should have acted	D．would act

Answer 1

A

解析试题分析：句意：他的行为也许不明智，但是他至少能够尝试做一些有帮助的事了。may have done可能已经做了；must have done一定做过某事；should have done应该应经做过某事； would done过去将要做。根据句意故选A。
考点：考查情态动词的用法。
点评：本题难度适中。情态动词是高中阶段的重要的语法项目，需要考生掌握它们的不同的语法及区别，尤其是情态动词的完成式表示对过去的推测，不同的情态动词推测的可能性大小上不同，需要考生理解它们的不同的语法。
即学即练：Why didn’t you tell me there was no meeting today ? I _____ all the way here through the heavy snow.
A. needn’t have drive
B. can’t have driven
C. mustn’t have driven
D. shouldn’t have driven
解析：A。句意：你为什么不告诉我今天没有会？我本来没必要冒着大雪开车跑这么多路。Needn’t have done表示本来没必要。答案为A。