2.sth take sb sometime to do 或者可用it takes sb sometime to do sth,本句是前者。
3.表达“生活与工作”固定结构life and work
4.necessity表示必要性,不能用a necessity,应用the或省the
因为此句的谓语是are,所以B是不对的。
[U]Necessary to any investigation of the causes of a newly-discovered disease [/U](倒装,表语)are [U]strictly followed [/U](做mechdologies 和data的定语)scientific mechdologies and scrupulously recorded data
1.前面已经解释了,不再重复。
[em12]
[此贴子已经被lucylu于2002-12-13 20:16:18编辑过] |