The old lady didn’t know

来源：学生作业帮编辑：灵鹊做题网作业帮分类：英语作业时间：2024/05/14 14:00:36

The old lady didn’t know when the house caught fire.

A．how to do

B．how to do with it

C．what to do

D．what to do it

C

考查疑问词+不定式作宾语。此题中what+to do形成固定短语做know的宾语。句意：当她的房子着火的时候这位老妇人不知道做什么。所以选C。

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