The biologist has been here for ______.A.one day or two B.one or two days C.a day or two days D.one and two days答案是选B的,可是我觉得A,C也可以啊,请问这是为什么啊?英语书上有这样的用法a tear or two =one or two tears

英语翻译In addition to finding an increase of suitable browse,like huckleberry and vine maple,ArthurEinarsen,longtime game biologist in the Pacific Northwest,found quality of browse inthe open areas to be substantially more nutritive. 英语翻译Brids in the city have to change their tune to be head above the noise,scientists from Holland found out.A biologist from Holland got the surprising result by studying the great tit,ONe of the most common birds in Europe.He traveled aroun 求答案以及解析,要有解析啊.每题3分.（更新）2.Bob Stephenson,a biologist in Alaska who studies the Canadian lynx,a type of wildcat,has learned_______ from studying their tracks in the snow.(A) how lynx hunt(B) lynx hunt how(C) how hu Be creful!the chair has only three The biologist has been here for ______.A.one day or two B.one or two days C.a day or two days D.one and two days答案是选B的,可是我觉得A,C也可以啊,请问这是为什么啊?英语书上有这样的用法a tear or two =one or two tears Please be informed that the pre-registration deadline has passed. Anyone who has broken the law should be punished.翻译 The cold night,has me to give you to be Paul has a strong p___and likes to be the leader The password has to be medium or strong. 现在分词做状语的问题— The woman biologist stayed in Africa studying wild animals for 13 years before she returned.在这里studying是现在分词做目的状语还是伴随状语啊,另外这里可以改成：The woman biologist stayed i A doctor has a brother,but the brother has no brother.How could that be? A police officer has a brother,but the brother has no brother.How could that be? Due attention has to be paid to the issue of Internet.这里has to The computer is broken.___it___today?A.Will ; repairB.Has ; repairedC.Will ; be repairedD.Has ; been repaired a medical biologist 请翻译成中文 英语语法问题（sat）the evolution of the platypus,originally called the watermole,is still a mystery to the biologist.originally called the watermole为什么一定修饰 Platypus,sat不是有考前原则吗?为什么不是修饰evolution.如 The suggestion has been made that the basketball game be put off.that the basketball game be put off是The suggestion has been made的什么成分?