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I think we'd better turn back_____it starts to rain.A.for fe

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I think we'd better turn back_____it starts to rain.A.for fear B.in case C.lest D.in order that
lest 和 in case有什么区别啊?
I think we'd better turn back_____it starts to rain.A.for fe
意思都是“以防,以免”.lest的从句一般要用虚拟语气,形式是“should+动词原形”或省掉should.for fear that和in case从句一般用虚拟语气,但有时也可以用陈述语气.
in case+主语+动词可跟在陈述句或命令句后面:
lest除在较正式的书面英语中出现外,一般不常用.
I obeyed her lest she should be angry.我得顺着她,免得她生气.
答案补充:
我觉得一般情况下都用in case,只有比较正式时才用lest
Take a hat with you in case the sun is very hot.倘若太阳很利害,你就把帽子戴上