句型转换【只有一题】The youngest child is supposed (to start eating first)(对括号部分提问)____ ____ the youngest child _____ _____ ______ first?

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句型转换【只有一题】
The youngest child is supposed (to start eating first)(对括号部分提问)
____ ____ the youngest child _____ _____ ______ first?

对事提问用What
所以
what is ;supposed to do

What is supposed to do