2. 外语
  3. You can’t drink alcohol you are at least eighteen years old in some states of the US.

You can’t drink alcohol you are at least eighteen years old in some states of the US.

admin2010-06-03  37
问题 You can’t drink alcohol      you are at least eighteen years old in some states of the US.
选项 A、if
B、unless
C、though
D、when
答案B
解析 unless相当于if not。意为“如果不，除非”。引导条件状语从句时，主句常用否定形式。
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