问题
选择题
We have two rooms_________, but I can’t decide_________.
A．to live , to choose which one
B．lived, choose which one
C．to live in, which one to choose
D．live, which one
答案
答案：C
修饰名词动词短语在后通常用to do，若修饰的名词作后句的宾语，名词是地点
名词，介词不可省，故选C。
是多少？若接成三线制（即星形连接不用中线）A相断路时，线电流IB、IC是多少？