for fear与in case

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for fear与in case
Mrs.Smith locked both the frot and the back doors before she went to bed _____ that a thief might steal into the house.
A.so B.for fear C.unless D.in case
为什么选B,不选D?

for fear程度比in case情感上更加强烈,for fear 指的是以免怎么怎么样,唯恐怎么怎么样.in case指的是万一怎么样假使怎么样,在此句中完全体现不出情感,没有 for fear合适.

for fear that与in case比较 for fear that /in case in case of与for fear of的区别 in case of与for fear of的区别 in case 与for fear that 的区别, in case of与for fear of有什么区别? for fear that in case 的区别 in case that ,for fear that 区别 in case of、for fear of和in case that、for fear that的区别 for fear that 与 in case有何区别?3Q in case of 和for fear of用法的区别? 关于lest,for fear that,in case的用法