选什么,注明原因 There are twenty boys in our school.( )are from America.tThere are twenty boys in our school.( )are from America.A.two they B.the second c.two of them D.the two of them

选什么,注明原因 There are twenty boys in our school.( )are from America.tThere are twenty boys in our school.( )are from America.A.two they B.the second c.two of them D.the two of them
选什么,注明原因 There are twenty boys in our school.( )are from America.
tThere are twenty boys in our school.( )are from America.
A.two they B.the second c.two of them D.the two of them

选什么,注明原因 There are twenty boys in our school.( )are from America.tThere are twenty boys in our school.( )are from America.A.two they B.the second c.two of them D.the two of them
选C.A不对.人称代词主格要放在数词的前面,B不对,the second 是单数,与后面的are在数上不一致,D 不对,首次提到的这两个人不知具体到那两个.所以选C.

c
我们学校有20个孩子，两个来自美国
some/数字（基数词）of them 他们中的一些（数字），固定短语

C
数字+of+them 他们中的几个
我班有二十个男生，其中两个来自美国

C
其中的两个，没有特指，不需要加the
B the second 第二个人，与后面的are不搭
A two they 连在一起是不对的……

选 C， 意思是：他们当中的两个人是来自美国。
A的表达是错误的，B则表示第二个，后面谓语要用单数，所以不对；D 的表达是特指，在本句中并没有特别指某人的意思。