New ideas sometimes have to wait for years ______ they are fully accepted.A、when

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问题 New ideas sometimes have to wait for years ______ they are fully accepted.

选项 A、when
B、before
C、after
D、where

答案 B

解析考查时间状语从句。before引导时间状语从句时表示主句的动作发生在从句动作之前，一般译为“……才……”，句中主句的动作wait发生在accept之前，故选B。when引导的时间状语从句，表示“当……时候”；after引导时则与before相反，表示主句的动作发生在从句动作之后。

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