题目内容
（请给出正确答案）
[主观题]
You can't get a driver's license ______ you are at least sixteen years old. A) if B)
You can't get a driver's license ______ you are at least sixteen years old.
A) if B) unless C) when D) though
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C类IP地址的默认子网掩码都是 255.255.255.0。()
