Neverbefore_______sorapidlydevelopingasitistoday．
A、hasourcountrybeenA
此题考查倒装句。否定词位于句首，句子应该部分倒装。句意：我们国家从来没有像今天一样进步如此迅速。
Neverbefore_______sorapidlydevelopingasitistoday．
Robots differ from automatic machines ________ after completion of one specific task，they can be reprogrammed by a computer to do another one.
Thisisthemostbeautifulvillage_______Ivisitedtheseyears.
Robotsdifferfromautomaticmachines________aftercompletionofonespecifictask，theycanbereprogrammedbyacomputertodoanotherone.
When _______, water will be turned into steam.
