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

游客2023-09-25  18

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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