皮皮学，免费搜题
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搜题
【单选题】
处在海水、海风、氯离子、硫酸根离子环境的或冬季洒除冰盐的路面或桥面钢筋混凝土、钢纤维混凝土中宜掺()A.
减水剂
B.
引气剂
C.
早强剂
D.
阻锈剂
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】——Look at your pale face. You ______ a sleepless night. ——You bet. The work site next to the hotel was so noisy.
A.
must have had
B.
might have
C.
should have had
D.
cannot have had