Soon, more of the information we receive via the Internet could come (31) in digital wrappers.
Wrappers are made up (32) software code that’s targeted to do specific things with the data (33) within them, such as helping to define queries for search engines. They also keep (34) from (35) access to that code.

A．gain

B．gained

C．gains

D．gaining

油品自然损耗如何按产生原因、作业环节分类的？