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。
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