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76 简答题。 经典H1受体拮抗剂的几种结构类型是相互联系的。试分析由乙二胺类到氨基醚类、丙胺类、三环类、哌嗪类的结构变化。 答案是:( )
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【简答题】Joe had many regrets when he __________ the years he spent abroad. A． looked back on B. looked down upon C. looked up to D. looked out of
【单选题】—How long _____ he ______ in the USA? —Three years. But he never regrets coming back to China.
A.
did;live
B.
has;lived
C.
does;live
D.
will;live
【简答题】His mother being very worried, he regrets (tell) ______ her that he has lost his job.
【单选题】He now regrets______harder when he was at school.
A.
not to study
B.
not studying
C.
having not studied
D.
not to be studying
【简答题】A．He doesn't care for children's programs. B．He regrets missing the program. C．He has already seen it. D．He enjoys the program.
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