2013年9月自考英语考试每日一练9.4

单选题

Mrs. Smith locked both the front and the back doors before she went to bed ______ that someone might steal into the house at night.

A. so

B. for fear

C. unless

D. on condition

编辑推荐：

2013年9月自考英语考试每日一练

（责任编辑：lqh）