[单选题]Mrs. Smith locked both the front and the back doors before went to bed _______ that someone might steal into the house at night.

for fear

unless

on condition

正确答案：B

题目解析

译文：史密斯夫人在上床休息之前总是将前后门紧锁，以防有人晚上进来偷东西。四个选项中，so指"因此"，引导一个句子；for fear指“以防”；unless指“除非”；on condition指“条件是"。根据句意，for fear最符合题意。答案为B。

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