I'll spend some time my study. [ ]
A. with
B. at
C. on
D. in
答案：C
续写要求：必须紧扣“快乐”与“痛苦”的关系，使用引用修辞格，文句有意蕴，不少于50字。
生命中的快乐和痛苦是相生相成，互相衬托的。
（）is a collection of data sets,which is so large and complex that it becomes difficult to process using on-hand database management tools or traditional data processing applications.
A.Big data
B.Cluster
C.Parallel computing
D.Data warehouse
