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几道大学英语选择题,望高手赐教,请说明原因.

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几道大学英语选择题,望高手赐教,请说明原因.
1、 Having been asked to speak at the convention_____.
A.some notes were prepared for Dr.Smith.
B.Some notes were prepared by Dr.Smith
C.The convention members were pleased to hear Dr.Smith
D.Smith prepared some notes
2、It is desirable that he ____.
A.gives up trying
B.give up trying
C.would give up trying
D.is going to give up trying
1 D having been asked是完成加被动的结构,独立做状语,表示这个动作在主句的动作之前发生,那么主句的主语就应该能够发出speak这个动作,比较一下四个选项的主语就可以看出来,只有D答案的主语是人,能够speak
2 B 虚拟语气的用法
出现desire和desirable的句子,宾语从句或表语从句中都用should do这个形式做谓语,should可以省略