Once these,has become the past...这句语法有错吗?

Once these,has become the Once these,has become the past...这句语法有错吗? The girl is an excellent student and not once in these years caught being late.A.has she got B.she has been C.was she D.she got为什么选A空在years 和 caught 之间 He came from a poor village in the first place,but now he has becom a famous writer.的同意句 Aunt Li has been to englang once 对once提问 are watered once flowers week these a 连词成句 she spits these words out and pivots once again pivots these are fiowers once watered a week 组成句子 he____there only once.a.has been b.has gone 英语翻译Increasingly,financial firms have a stake in these markets too.Trading in agricultural futures ,once a backwater,has boomed in recent years.In addition to atri-businesses,more instiutional investors,ranging from hedge funds to pension fud It has been raining these days. 英语翻译My grandma has _______________ these days. shanghai has ____ (development )quickly these years. 英语翻译But if these so-called epigenetic changes persist once the child is born and has children of its own,some of those offspring may be homosexual,the study proposes.其中changes persist什么意思,后面还跟了一个once.这句话怎么 How to becom a happy boy it has rained these days it has been rainning these days 什么区别 There has been plenty of rain these days.It has rained--- --- these day. For many years the earth has been unable to provide enough food for these rapidly expanding populations and the position is steadily deteriorating since the fertility of some of our richest soils has been lost and vast areas that were once fertile la