问题补充：
单选题Whenthefirebrokeout,Marydidn know___.A.what to doB.what doC.to do whatD.what thing to do
答案：
A解析Mary didn know what to do意为: Mary不知道该做些什么? what to do作know的宾语.
1200字范文，内容丰富有趣，写作的好帮手！
时间：2024-02-13 17:18:27
单选题Whenthefirebrokeout,Marydidn know___.A.what to doB.what doC.to do whatD.what thing to do
A解析Mary didn know what to do意为: Mary不知道该做些什么? what to do作know的宾语.
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