Up to about 250 million years ago the world had just one huge super-continent called Pangaea. Animals were able to move and intermix with __(26)__. About 200 million years ago this super-continent broke up into two continents: Laurasia and Gondwana. About 60 million years ago Gondwana broke up into __(27)__ later became South America, Africa, Antarctica, India and Australia. Since then Australia __(28)__ from the rest of the world by vast oceans. The animals there no longer had __(29)__ with animals from other parts of the world. They evolved separately. As a result, about 95 % of Australia’s mammals and 94 % of its frogs are found __(30)__ else in the world. Australia has lots of very unusual animals.
【題組】28. (A) is isolated (B) had isolated (C) has isolated (D) has been isolated
Since then Australia __(28)__ from the rest of the world by vast oceans.自從那之後，澳洲被廣大的海洋隔離在世界的另一個部分。 since then 搭配過去完成式表示過去某個時間之前完成的動作，句型:had + Vp.p.。by指被，需搭配被動語態:be動詞+Vp.p.。 =>過去完成被動 had been Vp.p.
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