问题
选择题
The pills him.If only he had taken them regularly.
A．could help
B．may help
C．must have helped
D．might have helped
答案
答案：D
考查情态动词用法。意为要是他经常服药，那些药本可能有他有帮助。 根据if only he had taken 可知，是对过去的虚拟，所以排除A，B. 而C意为一定做了某事，不符合题意