in case引导的状语从句
根据语境的不同，in case既可表示“如果”“万一”，引导条件状语从句；也可表示“以防（万一）”，引导目的状语从句。下面两道真题均选in case：
1. Leave your key with a neighbor ______ you lock yourself out one day. （北京卷）
A. ever since B. even if C. soon after D. in case
2. My parents live in a small village. They always keep candles in the house ______ there is a power cut. （重庆卷）
A. if B. unless C. in case D. so that
【解析】两道题都选in case，均表示“以防万一”。