A：行李之往来，共其乏困
B：失其所与，不知
C：樊於期偏袒扼腕而进曰
D：往而不反者
目前，广州市的外来人口已接近200万，其吸引外来人口的主要因素是（ ）
复数i(1-i)-1=（ ）
_________ quite well in the important exam, he came back home, _________ and smiling.
You must wear strong shoes and socks ____ you climb the mountains.
