Our civilization must not be thought of as ——in a short period of time.A.being created B.to have been created C.having been created D.to be created请问为什么不选A?能不能把每个答案 详解下

CIVILIZATION怎么样 civilization是什么意思? Civilization etiquette civilization是什么意思 In many ways ,the history of English words is the history of our civilization.这句话的中文意思是? 英语翻译Driven by economic profits,people neglect the damage on our environment caused by the“advanced civilization”. civilization可数吗? civilization 的意思是? civilization可数吗 civilization什么意思 dilmun civilization什么意思 civilization什么意思 alien civilization是什么意思 Minoan civilization是什么意思 Our modern civilization must not be thought of as ___in a short periodof time.A.to be createdB.having createdC.being createdD.tohace been created Our modern civilization must not be thought of as ___in a short period of time.A to be createdB having createdC being createdD to have been created our civilization cannot be thought of as---in a short period of time A having been created B being created 帮我分析一下 一个专四语法题Our civilization has accumulated an incredible amount of knowledge—be it scientific or artistic.谁能帮我分析一下这个句子谢谢