thebeginningof1990s,computersbecamecheaperandeasiertousein还是atinthebeginningof=atthebeginingof吗,这道题in和at都在选项中,求高手解答

Question

____the beginning of 1990s, computers became cheaper and easier to use
in 还是at
in the beginning of=at the begining of 吗,这道题in和at都在选项中,求高手解答

Answer 1

in the beginning通常是单独使用,较少跟of连用,意义为：“起初”、“在开始的时候”,暗含着后来有变化的意思；at the beginning则常与of连用.
所以这题应该用at the beginning.
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