英语选择并说明理由1/ He must be from Africa,_________ can be seen fro

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英语选择并说明理由
1/ He must be from Africa,_________ can be seen from his skin.
A.that B.as C.who D.what
2/ I was about to go shopping _________ it began to rain.
A.while B.as C.when D.though

第一题选 B
这道题考察的是非限制性定语从句.
非限制性定语从句可以由as 和 which 引导,
which 只能放在句中,（就事论事,可以指代前面的先行词,也可以指代前面整个一句话）
as 可以句首（往往是大家都知道的事情）
放在句中可以=which就事论事,也可以是大家都知道的事情.
这道题填 which 和 as 都对,都是指代前面整句话的内容.
Athat 不能出现在非限制定语从句中.
C指代的是人,这句话明显是指代前面的全部内容.
D不是定语从句的关系词.故错.
第二题：选C
记住句型即可：
be about to do sth when············刚好要做········突然···············

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