He bought a house for his children ________
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。
Onaverageabout￡5000ayearisspentoneachprivateschoolpupil,_______theamountspentonstateschoolpupils.
Thetrafficwasheldupformorethanthirtyminutes,________causedmetoarrivelate.
名词解释：offer
Theybuiltahighway_______themountains.
名词解释：privateinternationallaw
