You will find ___great benefit the computer you own can be ___you use it to help you work.第一格[A] what [B} how第二格[A] of each time[B] each time[C] each time when并说明句型结构,

第一格答案为B，第二个答案为C，句子的意思是：每次你用电脑来帮助你工作，你就会发现你所拥有的电脑给你带来了多大的好处。
句子的结构为：find＋宾语从句。第二个的When引导一个时间状语从句。

C

A, A 因为You will find what great benefit {the computer (you own)can be of } each time (when you use it to help you work). 这里应该是be of great benefit 的句型=beneficial eg.be of great value=valuable

You will find __what_great benefit the computer you own can be __each time_you use it to help you work.

B,C
You will find how great benefit {the computer (you own)can be } each time (when you use it to help you work).
you own 修饰the computer,简化句子时可略去.
each time 及其后面的是时间状语when 引导,是修饰的,简化时也可先不看.
此时就剩下you will find how great benefit the computer can be.翻译成你就会发现（你拥有的）电脑是多么有优势（每当你在工作中用它解决问题的时候）.