【题目】Leave your key with your neighbor you lock yourself out one day.
A. as long as
B. even though
C. in case
D. as if

【答案】C
【解析】句意：把你的钥匙留给你的邻居，以防你把自己锁在外面了。A. as long as“只要”；B. even though“尽管”；C. in case“以防”；D. as if“好像”。根据句意，选C。