We don`t know when we shall start .(改为to do 的结构) We don`t know when ____ _____.说出语法!to start

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Wedon`tknowwhenweshallstart.(改为todo的结构)Wedon`tknowwhen_________.说出语法!tostartWedon`tknowwhenweshallst

We don`t know when we shall start .(改为to do 的结构) We don`t know when ____ _____.说出语法!to start
We don`t know when we shall start .(改为to do 的结构) We don`t know when ____ _____.
说出语法!to start

We don`t know when we shall start .(改为to do 的结构) We don`t know when ____ _____.说出语法!to start
to start.
是一个固定结构,“特殊疑问词+to do

to start