The life of a high school student is usually active exciting and full of fun but it be

问题补充：

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

答案：

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。