【高一英语】from other continents for millions of years,Australia has many plants and ...from other continents for millions of years,Australia has many plants and animals not found in any other country in the world.A.Having sepa

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【高一英语】________from other continents for millions of years,Australia has many plants and ...
________from other continents for millions of years,Australia has many plants and animals not found in any other country in the world.
A.Having separated
B.Having been separated
C.separated
D.separating
求详解.
而且老师好像说非谓语中分词作状语在句首只能用doing和done的结构?我们还没正式开始学非谓语,所以有点糊涂,也记不太清老师是不是这样说的了额...

1.从时间状语for millions of years来看,本句应用完成时,那么就排除
C.separated
D.separating
2.从逻辑来看,澳大利亚是被分离的,所以用被动,排除A.Having separated
所以选B
老师好像说非谓语中分词作状语在句首只能用doing和done的结构,其实这里的having=doing.
只是包含了更复杂的完成时的被动式
希望能帮到你,不明白还可以追问.
你要快点采纳哟,嘻嘻!

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