since用于完成时时,since的从句（时间状语从句）一般用过去时,表示过去时间中发生或进行的动作,前面主句用现在完成时
当然since后面也可不用从句,这个时候since用作介词,后面跟名词,如：since liberation 自从解放起
题目的句子语法（时态）是正确的
请看看这句话 but the environment here has become noisy since the c
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