Missing until recently were fossils clearly...语法结构问题，有整句

是个倒装。给你说说意思就懂了，就是说，处于陆生哺乳动物与鲸目动物之间的过度体动物化石直到最近才被挖掘出来。正常语序即Fossils that are clearly intermediate, or transitional, between land mammals and cetaceans had been missing until recently. 希望你看懂了O(∩_∩)O~

Missing until recently were fossils clearly intermediate,or transitional, between land mammals and cetaceans.

倒装，颠倒颠倒就明白了

Fossils clearly intermediate,or transitional, between land mammals and cetaceans were missing until recently.

好难哦

我不知道~！你问我电脑的问题吧~！