Only as a volunteer how important it is to grasp English.A. when will I work; I realizeB

问题补充：

Only as a volunteer how important it is to grasp English.

A. when will I work; I realize

B. when I work; I will realize

C. when I work; will I realize

D. when I will work; will I realize

答案：

A. when will I work; I realize

B. when I work; I will realize

(答案→)C. when I work; will I realize

D. when I will work; will I realize

解析：考查倒装结构。Only + 状语从句 + 主句，从句不倒装，主句的主谓要倒装，故选C。