单选题 Amy was elected chairman of the committee by a ______ vote.
A. ambiguous B. synonymous C. simultaneous D. unanimous

【正确答案】 D
【答案解析】[解析] (unanimous全体一致的)。句意为：经过一致表决，艾米被选为委员会主席。A．ambiguous模棱两可的；B．synonymous同义的；C．simultaneous同时发生的。