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31._____to make a speech,he said he would be glad to.

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31._____to make a speech,he said he would be glad to.
A.When asked B.When asking
C.When he was asking D.when to ask
31._____to make a speech,he said he would be glad to.
要理由对吗?好
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正确答案是When asked 或者When he was asked
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设计2个知识点
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1、就是被动语态
句子意思:当他被要求做演讲时,他说他会很乐意的
他是被要求的,那么,光这一条,所以要用asked,BCD就是明显不对的,马上排除
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2省略句以及相关例子
复合句的省略
1.在含有状语从句的复合句中
由when,while,as, once,whenever引导的时间状语从句;或由if,unless引导的条件状语从句;由though,although,even if ,even though引导的让步状语从句;由as though,as if,as引导的方式状语从句;由because引导的原因状语从句;由wherever引导的地点状语从句,若从句的主句是it或与主句的主语相同,且在谓语中含有be时,常省略从句的主语和be.例如:
When (she was) asked , she didn’t answer a word. 当她被问到的时候,她一句话也说不上来.
Water can be changed into vapor if (it is ) heated. 水如果被加热就能变成水蒸气.
When (you are) working ,you must pay attention. 当你上班的时候, 你必须全神贯注.
We may try again when (it is ) necessary . 当它有必要的时候,我们可以再试一次.
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