楼顶用什么隔热好:That is photo when he was _____he was in the army

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A in the 20 that B in the 20s when
C in his 20s that D in his 20s when
请说明为什么 谢谢

应选B。
That is photo when he was in the 20s when he was in the army.
第一个“when”引导的是状语从句;
20s表示1世纪20年代,前面不能出现形容词形物主代词;
第二个“when”引导的是定语从句,它修饰“20s”。修饰一个时间的定语从句可以用关系副词“when”引导,也可以用“介词+which”引导,不能用“that”。
全句翻译:这是他一世纪二十年代参军时的照片。

在某人20多岁时,in one's twenties/in one's 20s
后面用when,意思是当时他还在军中服役。

答案D。

D
in one's 20s 在某人20多岁时

类似还有:in her 30s等等

D

that is photo when he was( )he was in the army

when he was......是状语从句

看选项,in the 20, in the 20s的表达都不准确,在他20多岁应该是in his 20s 排除A,B
引导后面的 时间状语从句he was in the army,只能用when

D
in somebody's+数字+s是固定搭配,_ he was in the army是用来修饰年龄的,用when表示时间

D