She is a hardworking student and all her spare time she has staying in the library.A. s

问题补充：

She is a hardworking student, and all her spare time she has staying in the library.

A. spent

B. is spent

C. to spend

D. to be spent

答案：

A. spent

(答案→)B. is spent

C. to spend

D. to be spent

解析：B 考察时态和语态。句意：她是一个勤奋刻苦的学生，她所有的业余时间都是在图书馆里度过的。句式分析可知all her spare time在句中是主语，she has为省略了引导词that或which的定语从句，主句中缺少谓语动词，且根据句意可知此处应该使用被动语态，故B正确。