英语疑难问题1.It is seven years----------they entered the high sch

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英语疑难问题
1.It is seven years----------they entered the high school..
A.when B.since
2.They went----------Beijing on foot.
A.as long as B.as far as C.farther D.far away
需原因!

1.B
翻译：自从他们进入高中以来,已经七年了.
这是一个固定句型：It is + 一段时间 + since引导的时间状语从句（从句必须使用一般过去时）.
根据since从句的动词的延续与否,翻译成不同的意思.
如果从句谓语动词是瞬间性动词,则正常翻译.如：It is 3 years since I came here.自从我来这儿,已经三年了.
如果从句谓语动词是延续性动词,则否定翻译.如：It is 3 years since I worked there.自从我不在那儿工作以来,已经三年了.
when没有此类固定的句型.
2.B
翻译：他们步行,足迹远至北京.
as long as有三种理“只要”引导条件状语从句,此处其后非从句；“和...一样久（时间持续）”,用在此处句意不通；“和...一样长（长度）”,此处指距离,非长度.
as far as可以有两种理“至于...”,用于固定结构：as far as sb see/know/be concerned,此处不妥；“和...一样远/远至...”,为正解.
而CD都无法和其后的成分Beijing相连,排除.

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