Some refugees made______ new life for themselves across the border, but they were troubled with homesickness in _____later life.

A．a; 不填

B．the; the

C．a; the

D．不填; 不填

下列计算结果正确的是 [ ]

A．2x+5y=7xy

B．2a²+2a³=4a⁵

C．4a²﹣3a²=1

D．﹣2a²b+a²b=﹣a²b