时态的单选一道1.Man ____ profit, unaware of the harm he has done to the environment.a is always pursuingb was always persuingc had always pursuedd had always been pursuing选什么?为什么?

时态的单选一道1.Man ____ profit, unaware of the harm he has done to the environment.a is always pursuingb was always persuingc had always pursuedd had always been pursuing选什么?为什么? PR单是什么意思 _____ an ambulance man ______(wear) a uniform?什么时态的_____ an ambulance man ______(wear) a uniform?什么时态的还有A secretary ____(go) to the meetings and _____(answer) the phone.什么时态的,为什么 (1/2)问道英语单选 The policeman warned the young man ____ after drinking.A. _____ an ambulance man ______(wear) a uniform?什么时态的还有A secretary ____(go) to the meetings and _____(answer) the phone.什么时态的,为什么 关于英语的一道题,the animals in this zoo look ____(abuse).填一下时态. 请教一道英语单选,John Gilbert was a patient.He was ____ .A.a sick B.an ill C.a sick man D.not in a hurry这个是新概念二第39课的第10题我知道答案是C.但是我觉得A也是对的啊?因为,我查了字典,sick做名词也可表 一道头疼的地理单选 一道很难的地理单选 单选看见last用什么时态 高中英语单选一道 一道单选, 一道历史单选 一道英语单选（关于时态的）Great efforts to increase agricultural production must be made if food shortage_____avoid.A.is to be B.can be C.will be D.is ,选哪个?为什么? 关于时态的一道单选-- Did you get a dictionary?--- No,I _____,but there were not any _____.a、tried/left b、 had tried to/ left选A or 为什么 几道英语时态练习填空1.Mike always ____(halp)the old man.2.What ____you___ ___ ____ (do) tomorrow?3.I _____ ____ ____ ____ (visit)grandparents next week.4.Amy ______________(climb)mountains nest week.5.Mary ____ ____ (cook) dinner now.6.Sara A man may usually be known by the books he reads ____ by the friends he keeps.A rather than B.as well as C.in place of D.as many as 选什么?这是一道单选,这句话怎么个意义呢? 问一道关于概率的题我想问下,如果现在有2个人,然后一个人在今后的20年里死了,另一个或者那我该怎么算?是Pr=Pr(A活 and B死）+Pr(B活 and A死）还是单单就pr=pr（20年内死亡概率）*pr（存活概率