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一道完形填空.为什么这么填?

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/05/19 12:42:20
一道完形填空.为什么这么填?
Dolphins are social animals.Many of them even (1)____ around human.In addition to being playful,they are hulpful to men.For example,(2)____400 B.C.the Greek poet Arion was saved from drowning by a dolphin.
(1) A.go in for to be B.are used to be C.enjoy being D.fond of being
(2) A.as far as B.as long as C.as soon as D.as early as
为什么第二题不能选D呢?
到公元前400年和早在公元前400年好像没什么具体的区别啊.
as far as 意思是远在公元前400年,
as early as  没有这种固定搭配