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英语选择_______isn't known.

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英语选择_______isn't known.
1._______isn't known.
A.if he has finished his work.
B.when is he going home.
C.whether he'll go with us.答案选C为什么?
2.welcome to my home
3.our teacher told me that _____.
A.the earth went around the sun.
B.the earth moves around the sun.
C.the earth is bigger than the sn.
D.the earth is smaller than the moon.答案选B为什么?
4.this bus is always late,____?
为什么填isn't it 而不是 doesn't it
does 表示什么及其用法请说明
1、A项if引导条件状语从句,不能做主语
B项语序有错误,应该是when he is going home.
2、对
3、C和D是常识性错误,地球比太阳小,比月球大
这句活是一个常识性真理,这类句子只用一半现在时,所以A错.
所谓的真理,就是指大家都知道而且显而易见是对的,一般过很久也不会变的东西.比如,人类有两种性别.地球是圆的等等.
4、前面用的是系动词be的第三人称单数形式is,所以后面是那个
doesn't it用在前面是实意动词的时候,如take ,make,love,put等等吧.