do 后面其实是一个由 what 引导的宾语从句,改为陈诉语序为：they can do what.
由于前面的主句中已经有实意动词do 了,后面就不需要再加 do.
又如：You can eat what you like.
do what they can do后面的do 一定要省略吗?不省略行吗?
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