According to the American federal government,residents of Hawaii have the longest life ________:77.2 years.A.rank B.scale C.span D.scope为什么选C.span不是动词吗?句子已经有动词have了其他选项为什么不行if you had told us earlier he was ,we could habe introduced him at the meetingAwho Bwhom Cwhich Dthat选什么,但是who whom不是不能在定语从句中做表语吗?我觉得应该选which

life span 是寿命的意思；span也是名词，意思是 跨度；范围。所以选 C
who 是对人的连接代词，这里指得是人，当然用who，这个好像没有什么争议的。

谢谢！

C
span 最长的生命周期
根据美国联邦*的资料，夏威夷居民的寿命最长达到77.2岁。
scope指范围，范畴，领域等；rank指等级、阶级；scale指刻度，比例，数值范围等。
第二题，不是仅仅看是哪一个，还要看意思。如果表达，我不知道她是谁，你岂不是没法说出来了，就是I do not know who she is.
是宾语从句而不是定语从句。宾语从句可以是由who引导的。

1 the longest life span :77.2 years.
选C. span不是动词 是名词 life span 是寿命的意思
=the span of life .
其他选项就不用说了吧.
if you had told us earlier who he was ,we could have introduced him at the meeting
Awho Bwhom Cwhich Dthat
答案选A,这是宾语从句 不是定语从句 who 能在宾语从句中做表语
不应该选which.which指人不妥.