Although the causes of cancer ___,we do not yet have any practical way to prevent it.are being uncovered/ have been uncovering选哪个答案对呢,为什么?答案是are being uncovered 为什么呢?

the causes of the situation the tragic causes of Tess what causes the generation gap? 英语高考28.Although the causes of cancer ____,we do not yet have any practical way to prevent it.28.Although the causes of cancer ____,we do not yet have any practical way to prevent it.A.are being uncovered B.have been uncovering C.are uncoverin 英语翻译Although waterformation (experimentally measured) is considered19,28,31,32 anindication of Pd2+ in the absence of promoters (e.g.,halide ionsand acids),their addition causes Pd2+ to be active for H2O2production14-16,19,20,31-33 as well.Th Although the causes of cancer ___,we do not yet have any practical way to prevent it.are being uncovered/ have been uncovering选哪个答案对呢,为什么?答案是are being uncovered 为什么呢? Although the causes of cancer ____we do not yet have any practical way to prevent it.A.are being uncovered B.have been uncovering C.are uncovering D.have uncovered Congregation of the Saints' Causes 翻译 The sadness causes a long and wide What are the causes of crimes? what are the causes for certain crimes the causes of monopolistic competition什么意思 This causes the firefly to light up. heat causes the humidity after the rain?怎么翻译 what are the causes of the accident 同义句 although analyze the causes of carrie's tragedy in sister carrie 九年级的Pollution causes protect the environment的文章