The old lady didn't know---when the house caught fire.A how

问题描述：

The old lady didn't know___when the house caught fire.A how to do B waht to do求祥解
1个回答 分类：英语 2014-11-15

问题解答：

我来补答
The old lady didn't know_what to do __when the house caught fire.
因为：
how：对行为方式表示提问,是疑问副词.
how to do：怎么去做,do后要有宾语.
what：对行为内容表示提问,是疑问代词.
what to do：做什么,what即是do的宾语
 
 
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