问题: 两道英语选择题
1. Could you let me know______ yesterday?
A why did you come late
B why you came late
C why do you come late
D why you come late
2 No one but the two girls ______all about it.
A haven't known B don't know
C know D knows
解答:
1. Could you let me know___B___ yesterday?
A why did you come late
B why you came late
C why do you come late
D why you come late
句子的时态由yesterday确定，所以用过去时。又可以分析横线上应该填写一个宾语从句，整体做know的宾语，疑问内容恢复陈述句语序，然后come改成came.综上选B。
2 No one but the two girls ___D___all about it.
A haven't known B don't know
C know D knows
but ...是插入语成分，即分析句子成分和划分主干时候可以略去的一部分，对句子的主谓一致不构成影响。决定单复数的是前面的主语no one，一般视为单数，强调个体。选D。
参考文献：http://blog.sina.com.cn/calendula28
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