This is the most beautiful village _______ I visited these years.
D
分析句子成分后发现，visit为及物动词，所缺部分为宾语，所以应该选择关系代词。因为这里涉及到了最高级，所以只能选that。
Never before _______ so rapidly developing as it is today．
Basically，these attitudes amount to a belief ________ leisure can and should be put to good use
AlthoughTomissatisfiedwithhisacademicachievement，hewonders_______willhappentohisfamilylife.
Robots differ from automatic machines ________ after completion of one specific task，they can be reprogrammed by a computer to do another one.