Language has always been —— as the phrase goes —— the mirror to society. English is no A.

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A. explanation
B. excuse
C. exception
D. expectation
解析：考查名词辨析：A.explanation解释B.excuse 借口C.exception例外D.expectation期望，句意：正如这个短语说的：语言一直是社会的镜子，英语也不例外。选C。