Never before _______ so rapidly developing as it is today．
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。
Duringthepasttwodecades,researchhas________ourknowledgeofdaydreaming.
Theyshouldtryto________theirusualinhibitionsandjoininthefun.
英文翻译：在经济危机之后，人们不再认为他们房子的价值会继续升高。
It is vital that the work _______ in time.
Robots differ from automatic machines ________ after completion of one specific task，they can be reprogrammed by a computer to do another one.
