Only ____ as a volunteer ____ how important it is to grasp English.
A．when will I work; I realizeB．when I work; I will realize
C．when I work; will I realizeD．when I will work; will I realize
C
考查倒裝結構。Only + 狀語從句 + 主句，從句不倒裝，主句的主謂要倒裝，故選C。
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