总结一下:(仅供参考)主要是在AD中选择 1. what was/that is是啰嗦的选项 2. 主语是fossils,注意主谓要一致 3.AC的found前无逗号就近修饰sloth;D的found前有逗号,修饰the subject of main sentence 4. B选项刨除插入语后,has不能与fossils主谓一致 5. A中it指代不明 6. A中made it的主语是fossils,不合逻辑意思,fossil 本身怎么可能made it the earliest known mammal of....呢,当然是因为fossil be dated 34 million years old 才是真正原因 7. A选项中两个对象并列直接用and即可,不需在and前加逗号
I agree with you on choosing D. Besides the mismatch you metioned, the "this" in C looks ugly and awkward, But "mammal of" in C seems better than "mammels on", preposition always confuses me. NN, pls come to help!
-- by 会员 tianwan (2004/6/16 21:52:00)
make sth known on islands. not make sth known for islands. ON 是和islands搭配