求助og16的96题

lwying

94. Fossils of the armof a sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it theearliest known mammal of theGreater Antilles Islands.

我有一个选项不明白(B) sloth, that theyfound in Puerto Rico in 1991, has been dated at 34 million years old, thus making it the earliestmammal known on

其中that在语法上是修饰fossils还是就近修饰sloth，多了一个逗号就分不清了

lwying

自顶～～～～～