Fossils of the arm of a sloth that was found in Puerto Rico in 1991, was dated at 34 million years old, making this the earliest known mammal of the Greater Antilles Islands.
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ManFenJing 2016-08-11 17:14:12
主语是fossils
浮云wei证 2017-07-30 10:29:08
was主谓不一致；this不能单独出现；
interesting 2015-06-02 07:55:15
that was不对 fossils是复数 并且that were 也是可以省略的 this无所指代
krisilybaby 2017-12-24 19:07:07
that was应省略 谓语was应改为were this无指代
不会飞的猪妞儿 2017-12-17 22:39:22
主语是fossils,谓语为was，主谓不一致
PolarisZ 2017-12-15 10:34:33
was dated 指代对象不清楚
MissZZAA 2017-12-13 23:05:51
were found，were dated
favorAstra 2017-09-07 11:37:18
that 修饰的应该是fossil 而不是 sloth
Maxim712 2017-07-15 11:31:43
由于主谓一致，was dated 中的was作为谓语应该和主语fossils的单复保持一致，应该用were
seven0511 2017-06-28 22:53:48
this单独出现指代不清 was found 单复数不一致
姚斯流 2017-02-22 13:15:21
this指代不明 that was 后面应该是were
yuki77529 2017-01-05 05:00:02
主语是fossils，was作为谓语，主谓不一致
