高一英语定语从句1.Let’s go and visit Mr.Brown,_____ you know visited

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高一英语定语从句
1.Let’s go and visit Mr.Brown,_____ you know visited us last year.
A.that B.who C.whom D.whose
2.I’ll do everything I ____ him.
A.must help B.should help C.can to help D.can help
3.The 11th Asian Games,____ China won 183 gold medals,was held in Beijing in the autumn of 1990.
A.which B.that C.at which D.at that
这三道题的答案是BCC
我想请大家帮忙分析一下选择的理由,要详细一点,

1.先看从句,you know属于插入语,可以无视,从句就变成了______visited us last year.显然缺少的是主语,一定要从关系代词中选择可以充当成分的,而主句中的Mr.Brown告诉我们,先行词指代的是人物,又是作主语,所以只能用who.A中的that不能用于非限制性从句,C只能充当宾语,不符题意.D也不能单独充当主语.
2.I’ll do everything +that被省略+ I can /// to help him.
我想你不明白的有两点,一是省略,二是分析后半句的成分.
因为that在句中是充当宾语,所以可以省略；
看见下划线了吧,在那里断开一下,分成两个句子,to help him是目的,作状语.A,B,D在语义上都可勉强通过,但却不符合目的状语这一要求,故排除.
3.这道题,类比第一题来看,可先排除B,对吧?再看D,that这个词,不能充当介词宾语,也就不能放在at之后,排除.从句是 China won 183 gold medals
不缺成分,从这一点上,可以排除A.再看C.at which,还原即是at the 11th Asian Games,which作介词at的宾语.
第三题的解释可能有点乱,如果还不明白可以给我留言,我会看的.
我也是从你这种状况慢慢走过来的,加油!

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