They must have been enjoying themselves there,otherwise they

来源：学生作业帮编辑：大师作文网作业帮分类：英语作业时间：2024/10/06 01:34:29

They must have been enjoying themselves there,otherwise they_ so long.
问题主要在选项B.wouldn't have stayed 和选项D.couldn't stay 之间.have been enjoying不是持续到现在的吗?为什么不能选D,而选B?

这是考虚拟语气.根据前一句的意思他们肯定在哪里玩得很开心,后一句otherwise they_ so long.应该是“否则他们不会呆这么久”.而D是“不可能呆那么久”因此选择B
再问：为什么不可以理解为“否则他们不可能在那里呆得了那么久”？
再答： D是“不能呆那么久”对不起，刚才打字快了犯了个错误。“不可能做了某事”应该是couldn't have done 结构
再问：那是不是B比D更符合语境？
再答： B是正确的，D不合这个句子的意思

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