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【单选题】
人类赖以生存和发展的第一要素是:A.
生育
B.
科技
C.
饮食
D.
道德
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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A.
have
B.
had
C.
have had
D.
would have