皮皮学，免费搜题
登录
搜题
【单选题】
保护醛基常用的反应是A.
碘仿反应
B.
羟醛缩合
C.
缩醛的生成
D.
还原反应
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】We first met on a train in 2010，but we both felt immediately that we ________ each other for years.
A.
knew
B.
have known
C.
had known
D.
know
【简答题】We inform. you that we have been engaged in this business for the past 25 years. We, therefore, feel that because of our past years' experience, we are well qualified to take care of your interests at...
【单选题】We________contact with each other for years.But last week we________contact again. [ ]
A.
lost；make
B.
have been out of；got into
C.
had been out of；made
D.
came；kept
【简答题】Economically speaking, are we better off than we were ten years ago? Twenty years ago? In their thirst for evidence on this issue, commentators seized on the recent report by the Census Bureau, which ...
【简答题】We could see the house ______ (not clean)for years．
【单选题】— You seem familiar with Mr. John? —Of course, we _________ together for three years in the 1990s.
A.
have worked
B.
were working
C.
are working
D.
worked
相关题目：
参考解析：
知识点：
题目纠错 0
发布
