Heboughtahouseforhischildren________
A、livedinB
本题属于动词不定式复合结构做后置定语。 in 不可省略。句意：他买了一套房子给孩子们住。
TheFrenchmaintaina________separationofpersonalandprofessionallife.
He declined _______ more about it.
The traffic was held up for more than thirty minutes, ________ caused me to arrive late.
They built a highway _______ the mountains.
There are many sales this season, during which stores will lower their _______ prices.
