单选题
Over the centuries, various theories have been ______ to explain the origin of alphabetic writing.
A、
advanced
B、
subjected
C、
released
D、
abandoned
【正确答案】
A
【答案解析】
advance提出(建议、看法、理论)。subject使服从。release放开；发布(行)。abandon抛弃；放弃。
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