The life of a high school student is usually active, exciting and full of fun, but it be stressful sometimes.
A. must
B. can
C. need
D. should
网友回答
A. must
(答案→)B. can
C. need
D. should
解析：考查情态动词用法。Must一定，必须；B可能；C需要；D应该。句意：高中生活通常是积极的，让人兴奋的，充满快乐的，但是有时候可能是很有压力的。故B正确。