become是非延续性动词,它的延续性动词是been。became是过去式 这里因为前面有了has,那么就是现在完成时了 现在完成时的构成是have(has)+过去分词 而become的过去式是became,过去分词是become【附】延续性动词表示能够延续的动作。如:study, work, stand, lie, know, walk, keep, have, wait, watch, sing, rea...
百度试题 结果1 题目 2. Humans have lived on the earth for only 35, 000years. ((对划线部分提问)How long have humans lived on the earth? 相关知识点: 试题来源: 解析 答案见上 反馈 收藏
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若仅从答句来看，四个答案都说得过去。但若结合问句的语境以答案应选D，因为其余三选项填入空格均不能回答问句所提出的问题。
G. (2013). How long have adult humans been consuming milk? IUBMB Life 65(12): 983-990.P. Gerbault et al., How long have adult humans been consuming milk ?, IUBMB Life, vol. 65(12), pp. 983-990, 2013.Gerbault P, Roffet-Salque M, Evershed RP and Thomas MG (2013) How ...
Gerbault P, Roffet-Salque M, Evershed RP, Thomas MG. How long have adult humans been consuming milk? IUBMB Life. 2013;65:983-90. doi: 10.1002/iub.1227.Gerbault, P., Roffet-Salque, M., Evershed, R., Thomas, M. (2013) Critical Review: How Long Have Adult Humans Been Consuming...
How long have you been here?M: Only a week.W: Oh, not long. Where do you live, with a family?M: Yes, I'm staying with a retired couple at the moment. They're very nice, but I'm looking for a new place where I can hang out with more people of my age. Do you know of ...
You may feel it start as a dull headache. Before long, you might not know where you are or what time it is. This story was originally published by HuffPost and has been republished here as part of the Climate Desk...
Like other species, we are the products of millions of years of adaptation. Now we're taking matters into our own hands.
How long have Homo sapiens sapiens been around?Homo Sapiens and Homo Sapiens Sapiens:All living humans are Homo sapiens. In fact, they are Homo sapiens sapiens, which helps to differentiate modern humans from other kinds of ancient humans, such as Homo sapiens neanderthalensis or simply Homo ...