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.
Thetrafficwasheldupformorethanthirtyminutes,________causedmetoarrivelate.
Thewoundedsoldierswouldrecoverquicklyiftheywerewell________.