We lived together before.A. as happy asB. so happy asC. as happily asD. so happily as

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A. as happy as
B. so happy as
(答案→)C. as happily as
D. so happily as
解析：
这题考查形容词、副词的用法，这题用happily修饰live together，另外，“和…一样”用as…as,所以选C。