Heboughtahouseforhischildren________
B
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。
Toaworker,________fromthepointofviewofsocietyisnecessarylaborisfromhisownpointofviewvoluntaryplay.
—You were brave enough to raise objections at the meeting.
— Well, now I regret ________ that.
Therearemanysalesthisseason,duringwhichstoreswilllowertheir_______prices.
The French maintain a ________ separation of personal and professional life.