问题
选择题
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
答案：C
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。