( )have people done to their environment?A,what B,when C,where D,which

More amd more people have realised we won't have cleaner water to drink unless something _____ soonA.was done B.will be done C.to be done D.is done请详细讲讲,另外,be done在这里是什么意思 Has all that can be done been done?为什么用HAS 不用 HAVE但是PEOPLE也是整体，动词用复数 ( )6.Acomputer does only what thinking people _______. A. have it to B. nave it d( )6.Acomputer does only what thinking people _______.A. have it to B. nave it done C. have done it D. having it done .12.A computer does only what people ___.12.A computer does only what people ___.A.have it do B.have it done C.have done it D.having it done Could have done would have done should have done That(A) you have done(B) might do(C) harm to(D) other people many people would never have done what they did 译成中文不懂啊, no other people have ever done that before 这句话怎么翻译啊? 怎么改?Many people have done a lot for the Beijing Olympics.So do I. ( )have people done to their environment?A,what B,when C,where D,which W______their help,people have done m______research in many fields of science. must have been done must have done have done与have be done Many people have realized that we won't have any more clean water to drink unless something _____ to fight against pollution.A.was done B.will be done C.to be done D.is done more and more people have realized we will not have cleaner water to drink unless something——soonB will be done D is done More and more people have realized we won't have cleaner water to drinkunless something is done soon A computer does only what thinking people _____. (99上海19) A. have it do B. have it done C. have done it D. having it done为什么选A? would have done,might have done,could have done,should have done分别表示什么意思?