题干
— Mr. Green gets up very early every morning.
— Yes, so he always goes to work ______ time.
A：on
B：at
C：next
D：this
答案(点此获取答案解析）
A
— Mr. Green gets up very early every morning.
— Yes, so he always goes to work ______ time.
A：on
B：at
C：next
D：this
移民示意图。下列不属于这一期间移民因素的是( ) 
