When I am tired with math exercises I go out for a walk to get relaxed.A. shouldB. mustC.

问题补充：

When I am tired with math exercises, I go out for a walk to get relaxed.

A. should

B. must

C. need

D. will

答案：

A. should

(答案→)B. must

C. need

D. will

解析：本题考查情态动词。句意：做数学练习累了时，我经常出去散步放松一下。此处will表示习惯。