A-A+
The United States (is composed) of fifty state
问题详情
The United States (is composed) of fifty states, (two of those) are (separated from) (the others) by land or water.
A．is composed
B．two of those
C．separated from
D．the others
参考答案
正确答案：B
解析：应改为two of which。非限定性定语从句，which在从句中指fifty states。
