正确的句子应该是:"The development of COVID-19 vaccine had taken a lot of effort.",意思是 "研发COVID-19疫苗已经花费了很多努力。" 过去完成时(Past Perfect Tense)是英语中用来描述过去某个时间或事件之前已经完成的动作或状态的时态。它通常由"had"加上动词的过去分词构成。过去完成时主要用于以下几种...
11. (4.0分) The development of COVID-19 vaccine had ___(take) a lot of effort. 相关知识点: 试题来源: 解析 taken 该题考查过去完成时,表示在过去某一时间之前已经完成的动作。句子中 "had" 是过去完成时的标志,因此需要填入 "take" 的过去分词形式 "taken",表示 COVID-19 疫苗的研发在过去已经付...
A COVID-19 vaccine should reduce the risk of infection, illness, and resultant complications. Currently, the best way to prove effectiveness is through large clinical trials that compare outcomes of vaccinated with unvaccinated individuals. Such studies, involving thousands of patients, are currently p...
Development of COVID-19 vaccinia virusbased vaccineFumihiko YasuiYasushi ItohKenzaburo YamajiNaoki YamamotoYusuke MatsumotoTakahiro SanadaTomoko HondaTsubasa MunakataHirohito IshigakiMisako NakayamaExperimental Animals
百度试题 结果1 题目4. Close attention must be paid Cy pay)to the development of COVID-19 vaccine(疫苗). 相关知识点: 试题来源: 解析 答案见上 反馈 收藏
百度试题 结果1 题目4. Close attention must be paid (pay) to the development of COVID-19 vaccine(疫苗). 相关知识点: 试题来源: 解析 答案见上 反馈 收藏
BEIJING, Feb. 15 (Xinhua) -- China has adopted multiple technological approaches to fast-track the development of a vaccine for the novel coronavirus disease (COVID-19), according to an official Saturday. To speed up the development of a vaccine and increase the success rate, China is develo...
The milestones of COVID-19 vaccine development. With the maturity of vaccine platforms, more and more COVID-19 vaccines have entered clinical trials and been approved for emergency use in many countries. However, the appearance of VOCs has brought great challenges to existing COVID-19 vaccines....
BEIJING -- Studies have shown that the development of COVID-19 vaccines has not been affected by how the virus has mutated, a Chinese official said on Oct 20. China has paid close attention to the issue of virus mutation and has organized more than 30 res...
Surgeon General Vivek Murthy says in an upcoming interview on “The Carlos Watson Show” that the development of COVID-19 vaccines could speed up the creation of shots for other diseases. Watson, the co-founder and CEO of OZY, noted in an interview airin