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

游客2023-09-25 9

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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