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after several years of

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After several years of observation, the research group ________ the conclusion that language acquisition is faster when students ______ to the situation where it is spoken A has come to ; expose B have arrived at ; are exposed C has concluded; are exposed D have reched; expose 请给出您的解释
after several years of
解题思路： 全面细致地找出做题的关键点，分析对比每一个知识点和结构，配以适当的翻译。
解题过程：
答案 B
经过几年的观察，这个研究队已经做出了这样的总结，当学生被暴露在
说英语的情境下，语言习得更快。
析：第一个空固定短语，arrive at the conclusion ,group 是集合名词 ，
看成个体时用复数位于动词。
第二个空表示被动 be exposed to 被暴露在。。。
最终答案：如上
After several years of observation,the research group ______ several years after是什么书 快 很少的!( )1.After several years of development(发展）,the villag After several years’ hard working,he achieves success/his am Several will you also love me after a hundred years? several years 与couple of years的区别 after years and years of bad Over several thousand years of development,Chinese medicine after several rounds of talks,the five sides finally reached after several months of study my japanese gradually improved 26.After several days of investigation,the police declared t 高中英语after a journry of several months,columbus reached() he